The launcher name on Android 11 is returned as com.android.settings instead of the actual launcher package name

`getLauncherPackagename()` returns `com.android.settings`. So `mDevice.wait(Until.hasObject(By.pkg(launcherPackage).depth(0)), LAUNCH_TIMEOUT);` doesn't really wait for the launcher package.
I believe this is due to the package visibility changes on Android 11.

Our test setup consisted of this check before starting with the tests:
`String currentPackageName = device.getCurrentPackageName();
if (currentPackageName != null) {
assertEquals(packageName, currentPackageName);
}`

This failed as currentPackageName returned as `com.google.android.apps.nexuslauncher` and getLauncherPackagename() returned `com.android.settings`.

首先跟踪 getLauncherPackagename() 和 mDevice.wait(Until.hasObject(By.pkg(launcherPackage).depth(0)), LAUNCH_TIMEOUT) 调用，然后在 Android 11 上使用 device.getCurrentPackageName() 重现设置检查。完成的标准是将 launcher package 识别为实际的 launcher，而不是 com.android.settings，并且 wait 以该 package 为目标。

由索引模型根据 Issue 内容生成。