Fix overly strict Assert in jsonpath code

This was failing for queries which try to get the .type() of a
jpiLikeRegex.  For example:

select jsonb_path_query('["string", "string"]',
                        '($[0] like_regex ".{7}").type()');

Reported-by: Alexander Kozhemyakin
Bug: #18035
Discussion: https://postgr.es/m/18035-64af5cdcb5adf2a9@postgresql.org
Backpatch-through: 12, where SQL/JSON path was added.

src/backend/utils/adt/jsonpath.c

@@ -978,7 +978,8 @@ jspGetNext(JsonPathItem *v, JsonPathItem *a)
 			   v->type == jpiDouble ||
 			   v->type == jpiDatetime ||
 			   v->type == jpiKeyValue ||
-			   v->type == jpiStartsWith);
+			   v->type == jpiStartsWith ||
+			   v->type == jpiLikeRegex);
 
 		if (a)
 			jspInitByBuffer(a, v->base, v->nextPos);