Keybind overwrite spam when entering/exiting window management mode

[siddhpant]

Also there is spam of the following when exiting edit mode with Esc:

Overwriting existing binding of keysym 73 with keysym 73 (keycode 27).
Overwriting existing binding of keysym ff54 with keysym ff54 (keycode 74).
Overwriting existing binding of keysym ff52 with keysym ff52 (keycode 6f).
Overwriting existing binding of keysym ff54 with keysym ff54 (keycode 74).
Overwriting existing binding of keysym ff51 with keysym ff51 (keycode 71).
Overwriting existing binding of keysym ff51 with keysym ff51 (keycode 71).
Overwriting existing binding of keysym ff53 with keysym ff53 (keycode 72).
Overwriting existing binding of keysym 68 with keysym 68 (keycode 2b).
Overwriting existing binding of keysym 6c with keysym 6c (keycode 2e).
Overwriting existing binding of keysym ff52 with keysym ff52 (keycode 6f).
Overwriting existing binding of keysym ff53 with keysym ff53 (keycode 72).

Originally posted by @siddhpant in #1801