Stop using windowOptOutEdgeToEdgeEnforcement in CtsViewTestCases

Instead, this CL sets fitsSystemWindows to true to the content view.

Bug: 309578419
Bug: 377864165
Flag: com.android.window.flags.enforce_edge_to_edge
Test: atest CtsViewTestCases
Change-Id: I4a3e14277add43c3e0914729b4a6dca9a7b44c83