Merge pull request 'Theme should automatically change on phone settings change.' (#95) from theme-update into master

Reviewed-on: https://gitea.amine-louveau.fr/Louvorg/ReaderForSelfoss-multiplatform/pulls/95

androidApp/src/main/res/values/mode_settings.xml

@@ -9,7 +9,7 @@
     <string-array name="ModeValues">
         <item>1</item> <!--MODE_NIGHT_NO-->
         <item>2</item> <!--MODE_NIGHT_YES-->
-        <item>0</item> <!--MODE_NIGHT_AUTO_TIME-->
+        <item>-1</item> <!--MODE_NIGHT_FOLLOW_SYSTEM-->
     </string-array>
 
     <string-array name="Voice">