More collations cleanup, from trawling for missed collation assignments.

Mostly cosmetic, though I did find that generateClonedIndexStmt failed
to clone the index's collations.

src/backend/bootstrap/bootparse.y

@@ -345,6 +345,7 @@ boot_index_param:
 					n->name = $1;
 					n->expr = NULL;
 					n->indexcolname = NULL;
+					n->collation = NIL;
 					n->opclass = list_make1(makeString($2));
 					n->ordering = SORTBY_DEFAULT;
 					n->nulls_ordering = SORTBY_NULLS_DEFAULT;