android: Reintroduce launch mode as single top

src/android/app/src/main/AndroidManifest.xml

@@ -54,6 +54,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
         <activity
             android:name="org.yuzu.yuzu_emu.activities.EmulationActivity"
             android:theme="@style/Theme.Yuzu.Main"
+            android:launchMode="singleTop"
             android:screenOrientation="userLandscape"
             android:supportsPictureInPicture="true"
             android:configChanges="orientation|screenSize|smallestScreenSize|screenLayout|uiMode"