fix(client/v2): fix variable arguments

[julienrbrt]

Description

Support repeated coins.
EDIT: It turns out it was an issue with repeated coins.

There is no easy way to support coins as: 1000stake,100bar, with AutoCLI, the way to go will be 1000stake 100bar instead.

ref: #17478

follow-up of: #17306, #17707

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[julienrbrt]

Closing this, I'll re-create a PR for it.

[github-actions]

@julienrbrt your pull request is missing a changelog!

[atheeshp]

Suggested change

	return fmt.Errorf("coin flag must be a single coin, specific multiple coins with multiple flags or spaces")
	return fmt.Errorf("coin flag must be a single coin, specify multiple coins with multiple flags or spaces")