home: vim: tree-sitter: use explicit buffer option

Because of DPMS, I would still get a screen-lock after a 10-minute
timeout.

I think the `xset s {on,off}` part is not _strictly_ necessary, but a
little bit of cargo-culting never hurt anybody.

According to the `xss-lock` man page `xset s on` use hard-coded values,
not my preferred timeouts. Given that I rely on `xautolock` anyway, I
don't care about the timeouts and set them to `0`.

modules/home/terminal/alacritty/default.nix

@@ -10,7 +10,7 @@ in
     };
 
     alacritty = {
-      enable = mkEnableOption "alacritty" // {
+      enable = lib.mkEnableOption "alacritty" // {
         default = config.my.home.terminal.default == "alacritty";
       };
     };

modules/home/terminal/termite/default.nix

@@ -9,8 +9,8 @@ in
       type = with types; nullOr (enum [ "termite" ]);
     };
 
-    termite = {
-      enable = mkEnableOption "termite" // {
+    termite = with lib; {
+      enable = lib.mkEnableOption "termite" // {
         default = config.my.home.terminal.default == "termite";
       };
     };