Don't verify insets for floating windowing mode

After [1], WindowMetrics APIs report all insets regardless of
windowing mode, while View#getWindowInsets won't have any
inset if it is a floating window.

This CL changes to don't verify insets if the Activity's
windowing mode is floating.

[1]: Iae264b567c161bdf4f3d0248c5f81de92fd47828

Test: atest WindowMetricsOnActivityTests
fixes: 229824513
Change-Id: I4e910b82fa4550f78b464a7c2c351e99fc4e2762
2 files changed