Add void_function_in_ternary opt-in rule

[marcelofabri]

Fixes #2358

[SwiftLintBot]

	11 Warnings
⚠️	This PR introduced a violation in WordPress: /WordPress/WordPressThisWeekWidget/ThisWeekViewController.swift:123:53: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/WordPressThisWeekWidget/ThisWeekViewController.swift:358:23: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/Classes/ViewRelated/Post/RestorePostTableViewCell.swift:18:23: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/Classes/ViewRelated/Site Creation/SiteInfo/SiteInformationWizardContent.swift:322:24: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/Classes/ViewRelated/Themes/ThemeBrowserViewController.swift:606:30: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/Classes/ViewRelated/Notifications/Views/NoteBlockUserTableViewCell.swift:97:20: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/Classes/ViewRelated/Stats/Shared Views/TopTotalsCell.swift:296:22: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/WordPressAllTimeWidget/AllTimeViewController.swift:123:59: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/WordPressAllTimeWidget/AllTimeViewController.swift:354:23: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/WordPressTodayWidget/TodayViewController.swift:123:59: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)
⚠️	This PR introduced a violation in WordPress: /WordPress/WordPressTodayWidget/TodayViewController.swift:354:23: warning: Void Function in Ternary Violation: Using ternary to call Void functions should be avoided. (void_function_in_ternary)

	12 Messages
📖	Linting Aerial with this PR took 1.25s vs 1.22s on master (2% slower)
📖	Linting Alamofire with this PR took 2.29s vs 2.26s on master (1% slower)
📖	Linting Firefox with this PR took 9.48s vs 9.3s on master (1% slower)
📖	Linting Kickstarter with this PR took 15.57s vs 15.26s on master (2% slower)
📖	Linting Moya with this PR took 1.2s vs 1.18s on master (1% slower)
📖	Linting Nimble with this PR took 1.41s vs 1.41s on master (0% slower)
📖	Linting Quick with this PR took 0.55s vs 0.56s on master (1% faster)
📖	Linting Realm with this PR took 2.46s vs 2.39s on master (2% slower)
📖	Linting SourceKitten with this PR took 1.06s vs 1.04s on master (1% slower)
📖	Linting Sourcery with this PR took 7.03s vs 6.92s on master (1% slower)
📖	Linting Swift with this PR took 12.9s vs 12.75s on master (1% slower)
📖	Linting WordPress with this PR took 15.77s vs 15.56s on master (1% slower)

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