fix #3372:Resource Leak in SqlUtils.java

Author: xuugii

WordPressUtils/src/main/java/org/wordpress/android/util/SqlUtils.java

@@ -118,6 +118,7 @@ public static boolean dropAllTables(SQLiteDatabase db) throws SQLiteException {
             return true;
         } finally {
             db.endTransaction();
+            closeCursor(cursor);
         }
     }