Fix ErrorActivity colors

Author: krlvm

app/src/main/java/org/schabi/newpipe/error/ErrorActivity.java

@@ -137,6 +137,8 @@ private static void reportErrorInSnackbar(final Context context,
     protected void onCreate(final Bundle savedInstanceState) {
         assureCorrectAppLanguage(this);
         super.onCreate(savedInstanceState);
+
+        ThemeHelper.setDayNightMode(this);
         ThemeHelper.setTheme(this);
 
         activityErrorBinding = ActivityErrorBinding.inflate(getLayoutInflater());

app/src/main/java/org/schabi/newpipe/util/ThemeHelper.java

@@ -47,6 +47,9 @@ private ThemeHelper() {
      * Apply the selected theme (on NewPipe settings) in the context
      * with the default style (see {@link #setTheme(Context, int)}).
      *
+     * ThemeHelper.setDayNightMode should be called before
+     * the applying theme for the first time in session
+     *
      * @param context context that the theme will be applied
      */
     public static void setTheme(final Context context) {
@@ -57,6 +60,9 @@ public static void setTheme(final Context context) {
      * Apply the selected theme (on NewPipe settings) in the context,
      * themed according with the styles defined for the service .
      *
+     * ThemeHelper.setDayNightMode should be called before
+     * the applying theme for the first time in session
+     *
      * @param context   context that the theme will be applied
      * @param serviceId the theme will be styled to the service with this id,
      *                  pass -1 to get the default style