[fenix] For https://github.com/mozilla-mobile/fenix/issues/4438: Fix crash when opening any URL from URL bar w/ long press

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -133,6 +133,7 @@ open class HomeActivity : AppCompatActivity(), ShareFragment.TabsSharedCallback
 
     override fun onNewIntent(intent: Intent?) {
         super.onNewIntent(intent)
+        navHost.navController.popBackStack(R.id.homeFragment, false)
         handleCrashIfNecessary(intent)
         handleOpenedFromExternalSourceIfNecessary(intent)
     }

app/src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt

@@ -80,7 +80,7 @@ class IntentReceiverActivity : Activity() {
                 } else {
                     if (!intent.getBooleanExtra(NotificationManager.RECEIVE_TABS_TAG, false)) {
                         intent.flags =
-                            Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+                            Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
                     }
                     true
                 }