Fix sort bug on repository issues list (#28897) (#28901)

Backport #28897 by @lunny

Fix #28896

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/indexer/issues/db/options.go

@@ -38,7 +38,7 @@ func ToDBOptions(ctx context.Context, options *internal.SearchOptions) (*issue_m
 		sortType = "leastupdate"
 	case internal.SortByCommentsAsc:
 		sortType = "leastcomment"
-	case internal.SortByDeadlineAsc:
+	case internal.SortByDeadlineDesc:
 		sortType = "farduedate"
 	case internal.SortByCreatedDesc:
 		sortType = "newest"
@@ -46,7 +46,7 @@ func ToDBOptions(ctx context.Context, options *internal.SearchOptions) (*issue_m
 		sortType = "recentupdate"
 	case internal.SortByCommentsDesc:
 		sortType = "mostcomment"
-	case internal.SortByDeadlineDesc:
+	case internal.SortByDeadlineAsc:
 		sortType = "nearduedate"
 	default:
 		sortType = "newest"