fix: Removed Copyright from generated code

[tracyboehrer]

#minor

microsoft/BotBuilder-Samples#2625

[coveralls]

Pull Request Test Coverage Report for Build 7747844944

Warning: This coverage report may be inaccurate.

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A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 84.124%

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Totals
Change from base Build 7701125362:	-0.4%
Covered Lines:	20332
Relevant Lines:	22880

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💛 - Coveralls