Remove dependency to query text in JumbleQuery()

Since 3db72eb, the query ID of utilities is generated using the Query
structure, making the use of the query string in JumbleQuery()
unnecessary.  This commit removes the argument "querytext" from
JumbleQuery().

Reported-by: Joe Conway
Reviewed-by: Nathan Bossart
Discussion: https://postgr.es/m/ZJlQAWE4COFqHuAV@paquier.xyz

src/backend/nodes/queryjumblefuncs.c

@@ -97,7 +97,7 @@ CleanQuerytext(const char *query, int *location, int *len)
 }
 
 JumbleState *
-JumbleQuery(Query *query, const char *querytext)
+JumbleQuery(Query *query)
 {
 	JumbleState *jstate = NULL;