Use WEB_CHAT/SEND_EVENT for minimizable Web Chat sample

[compulim]

Fix #1619.

Updated to use WEB_CHAT/SEND_EVENT for minimizable Web Chat sample, instead of using DIRECT_LINE/POST_ACTIVITY, which is a low-level action.

Changelog

Samples

• *: Updated minimizable Web Chat sample to use WEB_CHAT/SEND_EVENT action, in #1631

[corinagum]

were you planning on updating the speech button sample at the same time? Or should I file a different issue?

[compulim]

      were you planning on updating the speech button sample at the same time? Or should I file a different issue?

Different issue. I was thinking the same too. :)

[coveralls]

Pull Request Test Coverage Report for Build 823

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 47.558%

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Files with Coverage Reduction	New Missed Lines	%
packages/component/src/Utils/TimeAgo.js	3	70.59%
packages/component/src/Utils/Timer.js	6	33.33%

Totals
Change from base Build 822:	-0.2%
Covered Lines:	792
Relevant Lines:	1503

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💛 - Coveralls