fix(tazjin/nixos): replace wezterm with alacritty again

wezterm has very strange rendering bugs which I have no interest in debugging

Change-Id: I59a068df9b4474830ba4706bf8e626b45cd015f0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12424
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

users/tazjin/nixos/modules/desktop.nix

@@ -35,11 +35,11 @@
     swaylock
 
     # support tooling
+    alacritty
     qt5.qtwayland
     sfwbar
     swayidle
     wdisplays
-    wezterm
     wl-mirror
     xfce.xfce4-appfinder
   ];