Config: Add comment before log_queries in sample ini file (#17462)

conf/sample.ini

@@ -100,7 +100,7 @@
 ;conn_max_lifetime = 14400
 
 # Set to true to log the sql calls and execution times.
-log_queries =
+;log_queries =
 
 # For "sqlite3" only. cache mode setting used for connecting to the database. (private, shared)
 ;cache_mode = private