Remove flaky annotation from CompatChangeTests

Bug: 270676645
Test: atest CtsWindowManagerDeviceTestCases:CompatChangeTests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:b7daa5a4334e118207d21402afdb18e4888bf027)
Change-Id: I4130a95c07e8a3cb9d3265f79f59ba39d4a4e8e5
1 file changed