ui/posframe: cleanup invisible posframes on ESC

This is meant to resolve an issue where posframes go rogue (e.g. after
an error), by deleting all (invisible) posframes when you press ESC or
C-g (doom/escape).

modules/ui/posframe/config.el

@@ -7,7 +7,7 @@
 (def-package! posframe
   :defer t
   :config
-  (setq posframe-inhibit-double-buffering t))
+  (add-hook 'doom-escape-hook #'+posframe|delete-on-escape))
 
 
 (def-package! company-childframe