Fix overwriting current pressed keys.
Fix overwriting current pressed keys.

This fixes a bug where the key at index 0 in the `key_state_array` would
be overwritten by the next pressed key. This broke any bindings
consisting of multiple non-mod keys like: `$mod+a+b`.

mikkeloscar/sway,johalun/sway,crondog/sway,4e554c4c/sway,ascent12/sway,ptMuta/sway,1ace/sway,taiyu-len/sway,ascent12/sway,ascent12/sway,SirCmpwn/sway,taiyu-len/sway,4e554c4c/sway,crondog/sway,mikkeloscar/sway,colemickens/sway,sleep-walker/sway,colemickens/sway,colemickens/sway,sleep-walker/sway,1ace/sway,taiyu-len/sway,1ace/sway