Fix: Opt-in default value to false (#4240)

Co-authored-by: Sharvani Haran <[email protected]>

Author: sharvaniharan

app/src/main/res/xml/preferences.xml

@@ -62,7 +62,7 @@
     <PreferenceCategory android:title="@string/preferences_privacy_settings_heading">
         <org.wikipedia.settings.SwitchPreferenceMultiLine
             android:key="@string/preference_key_eventlogging_opt_in"
-            android:defaultValue="true"
+            android:defaultValue="false"
             android:title="@string/preference_title_eventlogging_opt_in"
             android:summary="@string/preference_summary_eventlogging_opt_in" />
     </PreferenceCategory>