Fix context requirements of subcommands (#474)

`tea repo fork` and `tea pr checkout` were missing the requirement of a remote repo.

fixes https://gitea.com/gitea/tea/issues/444

Co-authored-by: Norwin <git@nroo.de>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/474
Reviewed-by: 6543 <6543@obermui.de>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Norwin <noerw@noreply.gitea.io>
Co-committed-by: Norwin <noerw@noreply.gitea.io>

cmd/pulls/checkout.go

@@ -35,7 +35,10 @@ var CmdPullsCheckout = cli.Command{
 
 func runPullsCheckout(cmd *cli.Context) error {
 	ctx := context.InitCommand(cmd)
-	ctx.Ensure(context.CtxRequirement{LocalRepo: true})
+	ctx.Ensure(context.CtxRequirement{
+		LocalRepo:  true,
+		RemoteRepo: true,
+	})
 	if ctx.Args().Len() != 1 {
 		return fmt.Errorf("Must specify a PR index")
 	}

cmd/repos/fork.go

@@ -33,6 +33,7 @@ var CmdRepoFork = cli.Command{
 
 func runRepoFork(cmd *cli.Context) error {
 	ctx := context.InitCommand(cmd)
+	ctx.Ensure(context.CtxRequirement{RemoteRepo: true})
 	client := ctx.Login.Client()
 
 	opts := gitea.CreateForkOption{}