Update command flag handling

`lmcli chat` now supports common prompt flags (model, length, system
prompt, etc)

pkg/cmd/retry.go

@@ -54,5 +54,7 @@ func RetryCmd(ctx *lmcli.Context) *cobra.Command {
 			return ctx.Store.ConversationShortNameCompletions(toComplete), compMode
 		},
 	}
+
+	applyPromptFlags(ctx, cmd)
 	return cmd
 }