Fix FogPublicValue#to_bool

[pocari]

Hi, I found a bug when converting to a boolean value with FogPublicValue.

In documentation,

# Possible values: true, false, "default" (default: true)
# config.fog_public = true

but, If false is set, to_bool method returns true
The following is a reproduction ...

% cat Gemfile
source "https://rubygems.org"
gem "asset_sync"
% cat main.rb
require 'asset_sync'

false_value = AssetSync::Config::FogPublicValue.new(false)
nil_value = AssetSync::Config::FogPublicValue.new(nil)
true_value = AssetSync::Config::FogPublicValue.new(true)

p false_value.to_bool
p nil_value.to_bool
p true_value.to_bool
% bundle exec ruby main.rb
true
false
true

I fixed it.

[coveralls]

Pull Request Test Coverage Report for Build 340

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 62.0%

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Totals
Change from base Build 338:	0.07%
Covered Lines:	341
Relevant Lines:	550

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💛 - Coveralls

[PikachuEXE]

Thanks :)
Will release a new version soon

[PikachuEXE]

Released as 2.8.1