gnu: grim: Fix output rotation interpretation with Sway 1.4.

* gnu/packages/image.scm (grim)[source]: Add patch.
* gnu/packages/patches/grim-revert-output-rotation.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/packages/wm.scm

@@ -1386,6 +1386,8 @@ modules for building a Wayland compositor.")
 (define-public sway
   (package
     (name "sway")
+    ;; XXX When updating, check whether grim-revert-output-rotation.patch can
+    ;; be dropped from the grim package.
     (version "1.4")
     (source
      (origin