issues list can show filtered by owner/org instead of repo too (#550)

close #551

Co-authored-by: Sysoev, Vladimir <vladimir.sysoev@sarov-itc.ru>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/550
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: vsysoev <vsysoev@noreply.gitea.com>
Co-committed-by: vsysoev <vsysoev@noreply.gitea.com>

cmd/flags/issue_pr.go

@@ -71,6 +71,10 @@ var IssueListingFlags = append([]cli.Flag{
 		Name:    "mentions",
 		Aliases: []string{"M"},
 	},
+	&cli.StringFlag{
+		Name:    "owner",
+		Aliases: []string{"org"},
+	},
 	&cli.StringFlag{
 		Name:    "from",
 		Aliases: []string{"F"},