Revert "Bugfix: Ignore enter_notify when warping pointer (makes "goto" work correctly)"

This reverts commit 7d6e80b5ef.
Instead fix it by setting focus correctly before causig the warp.

include/handlers.h

@@ -13,14 +13,6 @@
 
 #include <xcb/randr.h>
 
-/**
- * Adds the sequence number of an event to the ignored events.
- * Useful to ignore for example the enter notify caused by a pointer warp of
- * i3.
- *
- */
-void add_ignore_event(const int sequence);
-
 /**
  * There was a key press. We compare this key code with our bindings table and
  * pass the bound action to parse_command().