Fix show_incremental_sort_info with force_parallel_mode

When executed with force_parallel_mode=regress, the function was exiting
too early and thus failed to print the worker stats. Fixed by making it
more like show_sort_info.

Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com

src/backend/commands/explain.c

@@ -2880,9 +2880,11 @@ show_incremental_sort_info(IncrementalSortState *incrsortstate,
 
 	fullsortGroupInfo = &incrsortstate->incsort_info.fullsortGroupInfo;
 
-	if (!(es->analyze && fullsortGroupInfo->groupCount > 0))
+	if (!es->analyze)
 		return;
 
+	if (fullsortGroupInfo->groupCount > 0)
+	{
 		show_incremental_sort_group_info(fullsortGroupInfo, "Full-sort", true, es);
 		prefixsortGroupInfo = &incrsortstate->incsort_info.prefixsortGroupInfo;
 		if (prefixsortGroupInfo->groupCount > 0)
@@ -2893,6 +2895,7 @@ show_incremental_sort_info(IncrementalSortState *incrsortstate,
 		}
 		if (es->format == EXPLAIN_FORMAT_TEXT)
 			appendStringInfo(es->str, "\n");
+	}
 
 	if (incrsortstate->shared_info != NULL)
 	{