android: Fix black backgrounds bug

Start using a specific night mode check because black backgrounds could apply incorrectly when using the light app mode, dark system mode, and black backgrounds. Launching the settings activity will show light mode colors/navigation bars but with black backgrounds.

src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/ThemeHelper.kt

@@ -33,7 +33,13 @@ object ThemeHelper {
             DEFAULT -> activity.setTheme(R.style.Theme_Yuzu_Main)
             MATERIAL_YOU -> activity.setTheme(R.style.Theme_Yuzu_Main_MaterialYou)
         }
-        if (preferences.getBoolean(Settings.PREF_BLACK_BACKGROUNDS, false)) {
+
+        // Using a specific night mode check because this could apply incorrectly when using the
+        // light app mode, dark system mode, and black backgrounds. Launching the settings activity
+        // will then show light mode colors/navigation bars but with black backgrounds.
+        if (preferences.getBoolean(Settings.PREF_BLACK_BACKGROUNDS, false)
+            && isNightMode(activity)
+        ) {
             activity.setTheme(R.style.ThemeOverlay_Yuzu_Dark)
         }
     }
@@ -84,18 +90,24 @@ object ThemeHelper {
             activity.window,
             activity.window.decorView
         )
-        val systemReportedThemeMode =
-            activity.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
         when (themeMode) {
-            AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM -> when (systemReportedThemeMode) {
-                Configuration.UI_MODE_NIGHT_NO -> setLightModeSystemBars(windowController)
-                Configuration.UI_MODE_NIGHT_YES -> setDarkModeSystemBars(windowController)
+            AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM -> when (isNightMode(activity)) {
+                false -> setLightModeSystemBars(windowController)
+                true -> setDarkModeSystemBars(windowController)
             }
             AppCompatDelegate.MODE_NIGHT_NO -> setLightModeSystemBars(windowController)
             AppCompatDelegate.MODE_NIGHT_YES -> setDarkModeSystemBars(windowController)
         }
     }
 
+    private fun isNightMode(activity: AppCompatActivity): Boolean {
+        return when (activity.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK) {
+            Configuration.UI_MODE_NIGHT_NO -> false
+            Configuration.UI_MODE_NIGHT_YES -> true
+            else -> false
+        }
+    }
+
     private fun setLightModeSystemBars(windowController: WindowInsetsControllerCompat) {
         windowController.isAppearanceLightStatusBars = true
         windowController.isAppearanceLightNavigationBars = true