Assume deconstruct_array() outputs are untoasted.

In functions that issue a deconstruct_array() call, consistently use
plain VARSIZE()/VARDATA() on the array elements.  Prior practice was
divided between those and VARSIZE_ANY_EXHDR()/VARDATA_ANY().

src/backend/utils/adt/jsonb_gin.c

@@ -172,8 +172,8 @@ gin_extract_jsonb_query(PG_FUNCTION_ARGS)
 			if (key_nulls[i])
 				continue;
 			entries[j++] = make_text_key(JGINFLAG_KEY,
-										 VARDATA_ANY(key_datums[i]),
-										 VARSIZE_ANY_EXHDR(key_datums[i]));
+										 VARDATA(key_datums[i]),
+										 VARSIZE(key_datums[i]) - VARHDRSZ);
 		}
 
 		*nentries = j;