Revert "Check windowing mode in SplashscreenTests#testSplashscreenContent"

This reverts commit afdfa0e949662653a9d806cf609656649519e16e.
Bug: b/188754214
Test:
./cts-tradefed run commandAndExit cts \
        -m CtsWindowManagerDeviceTestCases \
        -t android.server.wm.SplashscreenTests#testSplashscreenContent

Change-Id: I4e709d3acbb93a2ee2d9f44bf6a5cc63fe1eba98
2 files changed