Corrected ActivityHandlerTests RemoveMember tests.

[tracyboehrer]

The TestMemberRemoved* tests appeared to be copies of the TestMemberAdded* tests, and they were still setup to test the members added. Fixed to populate the Activity.MembersRemoved and expected method assertions.

[coveralls]

Pull Request Test Coverage Report for Build 78740

• 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 80.364%

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Totals
Change from base Build 78465:	0.0%
Covered Lines:	3401
Relevant Lines:	4232

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.3.1
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✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.3.1
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