fix repo listing (#222)

fix type filter flag

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Norwin Roosen <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/222
Reviewed-by: 6543 <6543@noreply.gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>

cmd/repos/flags.go

@@ -22,6 +22,8 @@ func getTypeFilter(ctx *cli.Context) (filter gitea.RepoType, err error) {
 	t := ctx.String("type")
 	filter = gitea.RepoTypeNone
 	switch t {
+	case "":
+		filter = gitea.RepoTypeNone
 	case "fork":
 		filter = gitea.RepoTypeFork
 	case "mirror":