Remove redundant modifier in interface declaration

Author: Eduard Bolos

core/src/androidTest/java/novoda/lib/sqliteprovider/sqlite/InsertHelperTest.java

@@ -143,7 +143,7 @@ private void onQueryOf(String tableName, CursorOperations cursorOperations) {
         }
     }
 
-    private static interface CursorOperations {
+    private interface CursorOperations {
         void doOperationsOn(Cursor cursor);
     }
 }