Fix reopen recent app test logic on large screen

Previously we were tapping on the exact middle of the screen to re-open
the most recent app, however this proved a bit brittle. Replacing with
the functionality from tapl to avoid any future breakages.

Bug: 312586353
Test: atest FlickerTestsIme2:ShowImeOnAppStartWhenLaunchingAppFromOverviewTest -- --module-arg FlickerTestsIme2:include-annotation:android.platform.test.annotations.Presubmit --module-arg FlickerTestsIme2:exclude-annotation:android.platform.test.annotations.IwTest
Change-Id: Idf62b9cc4b4bd635dc1ccee3f31a86b8eb581be3