rm isTaskRoot & NEW_TASK flag from notifi open

* Cleans up unneeded logic and confirmed no behavior changes.
* `FLAG_ACTIVITY_NEW_TASK` is not needed as `getLaunchIntentForPackage`
already defaults this.
   - See Android ASOP source code
   - Android 11 - https://cs.android.com/android/platform/superproject/+/android-11.0.0_r3:frameworks/base/core/java/android/app/ApplicationPackageManager.java;l=251
   - Android 4 - https://cs.android.com/android/platform/superproject/+/android-4.0.4_r2.1:frameworks/base/core/java/android/app/ApplicationPackageManager.java;l=121

Author: jkasten2

OneSignalSDK/onesignal/src/main/java/com/onesignal/OneSignal.java

@@ -2174,12 +2174,7 @@ static boolean startOrResumeApp(Activity inContext) {
       logger.debug("startOrResumeApp from context: " + inContext + " isRoot: " + inContext.isTaskRoot() + " with launchIntent: " + launchIntent);
       // Make sure we have a launcher intent.
       if (launchIntent != null) {
-         if (inContext.isTaskRoot()) {
-            inContext.startActivity(launchIntent);
-         } else {
-            launchIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-            inContext.startActivity(launchIntent);
-         }
+         inContext.startActivity(launchIntent);
          return true;
       }