Add presubmit tag for OpenAppToSplitScreenTest

The test OpenAppToSplitScreenTest was marked as flaky as it doesn't run because of b/161435597 when being on 90 degrees. So we are removing the flaky annotation and marking the test to only run on 0 degrees. Also adding the presubmit annotation. This test is similar to one of the test inside EnterSplitScreenTest that's been running with no problem.

Test: atest WMShellFlickerTests
Change-Id: I4e9496286210805e0a8d15d7905cf6fbbc28a4ed