Remove unnecessary & duplicated references

[gasper-az]

Removed unnecessary & duplicated references from Microsoft.Bot.Builder.Integration.AspNet.WebApi.Tests library

[coveralls]

Pull Request Test Coverage Report for Build 53112

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.023%

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Totals
Change from base Build 53069:	0.0%
Covered Lines:	4347
Relevant Lines:	5718

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💛 - Coveralls

[cleemullins]

No issues found in Microsoft.Bot.Builder.dll
No issues found in Microsoft.Bot.Builder.AI.Luis.dll
No issues found in Microsoft.Bot.Builder.AI.QnA.dll
No issues found in Microsoft.Bot.Builder.ApplicationInsights.dll
No issues found in Microsoft.Bot.Builder.Azure.dll
No issues found in Microsoft.Bot.Builder.Dialogs.dll
No issues found in Microsoft.Bot.Builder.TemplateManager.dll
No issues found in Microsoft.Bot.Configuration.dll
No issues found in Microsoft.Bot.Connector.dll
No issues found in Microsoft.Bot.Schema.dll

[cleemullins]

@gaspar - can you "touch" this PR in some way to cause the build to re-run? We had renamed this builds recently, and updated the Branch Protection rules. The easiest is to make a change of some sort and the then new build process will trigger.