only resize output when using wayland backend

surprisingly enough, real hardware complains

rc.fnl

@@ -13,11 +13,14 @@
        )]
   (socket-repl.start repl-socket-name))
 
+(fn resize-wayland-backend [output]
+  (when (string.find (output:name) "^WL-")
+    (output:set_mode 360 720 0)))
 
 (kiwmi:on
  "output"
  (fn [output]
-   (output:set_mode 360 720 0)
+   (resize-wayland-backend output)
    (let [[width height] (output:size)
          r (output:renderer)
          kill (texture.from-file r "close-window.png")