Android: Don't set android:debuggable="true"

In 5a1a642, I explicitly set android:debuggable="true" for Dolphin.
(By default, it's set for debug builds but not release builds.)
The reason I made the change is because debuggable must be set to
true in order to allow adb backup to be used with apps which target
Android 12. We have no reason to want to stop users from debugging
Dolphin and certainly no reason to stop users from using adb backup
(especially not after forced storage is going to force us to store
the User folder in app-specific external storage!), but,
it turns out that setting debuggable to true is forbidden by
Google Play "for security reasons". Go figure. The beta build
which was tagged earlier today was rejected because of this.

Source/Android/app/src/main/AndroidManifest.xml

@@ -38,9 +38,7 @@
         android:allowBackup="false"
         android:supportsRtl="true"
         android:isGame="true"
-        android:banner="@drawable/banner_tv"
-        android:debuggable="true"
-        tools:ignore="HardcodedDebugMode">
+        android:banner="@drawable/banner_tv">
         <meta-data
             android:name="android.max_aspect"
             android:value="2.1"/>