fix(channel): open up channel length

[wass3r]

❤ THANKS FOR HELPING OUT :D

Proposed change

Looks like channel id length has changed in some cases. This change will ease up on the length restriction. Will solve issue with some people seeing Unable to handle channel: UNKNOWN_* error messages.

Types of changes

What types of changes is this pull request introducing to flottbot? Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

You can fill this out after creating your PR. Put an x in the boxes that apply

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[github-actions]

Pull Request Test Coverage Report for Build 8dfff1171c7a48a5425e27df1870220d2445b0d5-PR-138

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 42.71%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
remote/slack/util.go	0	1	0.0%

Totals
Change from base Build 51b2b525f8b5feccd0e254aa4aa6e591dddfd0f1:	0.0%
Covered Lines:	788
Relevant Lines:	1845

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💛 - Coveralls

[pa3ng]

LGTM