Tell UI about backend pref default change to hopefully fix #358

app/src/main/res/xml/tabs_preferences.xml

@@ -10,12 +10,12 @@
         app:allowDividerAbove="false"
         app:iconSpaceReserved="false">
         <org.mozilla.fenix.settings.RadioButtonPreference
-            android:defaultValue="true"
+            android:defaultValue="false"
             android:key="@string/pref_key_tab_view_list"
             android:title="@string/tab_view_list" />
 
         <org.mozilla.fenix.settings.RadioButtonPreference
-            android:defaultValue="false"
+            android:defaultValue="true"
             android:key="@string/pref_key_tab_view_grid"
             android:title="@string/tab_view_grid" />
     </androidx.preference.PreferenceCategory>