Remove dead code in logger.py method get_search_results_for_query

The method get_search_results_for_query provides a means to search via a
passed in SQL query. This feature has been unused and dead since its initial
commit back in 2005 (commit e542fff69f), so just remove it.

src/common/logger.py

@@ -671,14 +671,6 @@ class Logger:
             # Error trying to create a new jid_id. This means there is no log
             return []
 
-        if False: # query.startswith('SELECT '): # it's SQL query (FIXME)
-            try:
-                self.cur.execute(query)
-            except sqlite.OperationalError as e:
-                results = [('', '', '', '', str(e))]
-                return results
-
-        else: # user just typed something, we search in message column
         where_sql, jid_tuple = self._build_contact_where(account, jid)
         like_sql = '%' + query.replace("'", "''") + '%'
         if year: