Remove wrong imports that cause failed build (commons-app#1775)

Author: misaochan

app/src/main/java/fr/free/nrw/commons/di/CommonsApplicationModule.java

@@ -24,9 +24,7 @@
 import fr.free.nrw.commons.wikidata.WikidataEditListenerImpl;
 
 import static android.content.Context.MODE_PRIVATE;
-import static fr.free.nrw.commons.contributions.ContributionsContentProvider.CONTRIBUTION_AUTHORITY;
 import static fr.free.nrw.commons.explore.recentsearches.RecentSearchesContentProvider.RECENT_SEARCH_AUTHORITY;
-import static fr.free.nrw.commons.modifications.ModificationsContentProvider.MODIFICATIONS_AUTHORITY;
 
 @Module
 @SuppressWarnings({"WeakerAccess", "unused"})