fix - issues #171 #175, Wootzapp supports single theme, multiple them…

…e support will be added in upcoming versions

src/chrome/browser/ui/android/night_mode/java/res/layout/radio_button_group_theme_preference.xml

@@ -22,7 +22,8 @@ found in the LICENSE file.
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           app:primaryText="@string/themes_system_default_title"
-          app:descriptionText="@string/themes_system_default_summary" />
+          app:descriptionText="@string/themes_system_default_summary"
+          android:visibility="gone" />
 
       <!-- override default padding top and bottom -->
       <org.chromium.components.browser_ui.widget.RadioButtonWithDescription
@@ -41,7 +42,8 @@ found in the LICENSE file.
           android:minHeight="@dimen/min_touch_target_size"
           android:paddingTop="8dp"
           android:paddingBottom="8dp"
-          app:primaryText="@string/dark_mode" />
+          app:primaryText="@string/dark_mode"
+          android:visibility="gone" />
 
     </org.chromium.components.browser_ui.widget.RadioButtonWithDescriptionLayout>