[android] Fix key install and revert to old icon_bg

`312b3d4743ad734ac3234385f1edaa94d5b69440`

Signed-off-by: crueter <crueter@eden-emu.dev>

src/android/app/src/main/java/org/yuzu/yuzu_emu/ui/main/MainActivity.kt

@@ -349,6 +349,8 @@ class MainActivity : AppCompatActivity(), ThemeProvider {
         val resultCode: Int = NativeLibrary.installKeys(result.toString(), extension);
 
         if (resultCode == 0) {
+            // TODO(crueter): It may be worth it to switch some of these Toasts to snackbars,
+            // since most of it is foreground-only anyways.
             Toast.makeText(
                 applicationContext, R.string.keys_install_success, Toast.LENGTH_SHORT
             ).show()

src/frontend_common/firmware_manager.cpp

@@ -46,7 +46,7 @@ FirmwareManager::InstallKeys(std::string location, std::string extension) {
     }
 
     jmethodID copyToStorage = Common::Android::GetCopyToStorage();
-    jstring jdest = Common::Android::ToJString(env, keys_dir.string());
+    jstring jdest = Common::Android::ToJString(env, keys_dir.string() + "/");
 
     jboolean copyResult = env->CallStaticBooleanMethod(
         native,