Fix cursor leak when resolving contact photos

Closes #2933

// FREEBIE

src/org/thoughtcrime/securesms/contacts/ContactPhotoFactory.java

@@ -10,7 +10,6 @@ import android.provider.ContactsContract.Contacts;
 
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.recipients.Recipient;
-import org.thoughtcrime.securesms.util.BitmapUtil;
 import org.thoughtcrime.securesms.util.LRUCache;
 
 import java.io.InputStream;
@@ -60,13 +59,16 @@ public class ContactPhotoFactory {
     if (contactPhoto == null) {
       Cursor cursor = context.getContentResolver().query(uri, CONTENT_URI_PROJECTION,
                                                          null, null, null);
-
+      try {
         if (cursor != null && cursor.moveToFirst()) {
           contactPhoto = getContactPhoto(context, Uri.withAppendedPath(Contacts.CONTENT_URI,
                                                                        cursor.getLong(0) + ""));
         } else {
           contactPhoto = getDefaultContactPhoto(context);
         }
+      } finally {
+        if (cursor != null) cursor.close();
+      }
 
       localUserContactPhotoCache.put(uri, contactPhoto);
     }