Yume: Replace Swaylock with Hyprlock

In `.config/hypr/keybindings.conf` SUPER + L is currently bound to swaylock. 
This rice does not appear to have a config for swaylock but does have a hyprlock config. In addition, the lock button in the sidebar runs hyprlock.
Recommend replacing `bind = $mainMod, L, exec, swaylock` with `bind = $mainMod, L, exec, hyprlock` in keybindings.conf.