Make testLauncherCallbackPackageRemovedMainUser less flaky

Before apply this change: iteration 20, pass 2 times.
After apply this change: iteration 20, pass 20 times.

Test: atest com.android.cts.devicepolicy.LauncherAppsSingleUserTest#testLauncherCallbackPackageRemovedMainUser --iterations 20
Bug: b/236216021
Change-Id: Ia4569e912687c36ee95ad7b6f9bf7a129dac0f68
2 files changed