home: firefox: tridactyl: fix 'editorcmd'

Turns out `alacritty` is smarter than `termit` with its handling of
command execution (i.e: actually expects multiple arguments to exec(2)).

So account for the difference in the module.

home/firefox/tridactyl/default.nix

@@ -1,6 +1,14 @@
 { config, lib, pkgs, ... }:
 let
   cfg = config.my.home.firefox.tridactyl;
+
+  term = config.my.home.terminal.program;
+
+  vimCommandLine = {
+    alacritty = ''-e "vim" "%f" "+normal!%lGzv%c|"'';
+    # Termite wants the whole command in a single argument...
+    termite = ''-e "vim %f '+normal!%lGzv%c|'"'';
+  };
 in
 {
   config = lib.mkIf cfg.enable {
@@ -9,11 +17,11 @@ in
 
       editorcmd = lib.concatStringsSep " " [
         # Use my configured terminal
-        config.my.home.terminal.program
+        term
         # Make it easy to pick out with a window class name
         "--class tridactyl_editor"
         # Open vim with the cursor in the correct position
-        ''-e "vim %f '+normal!%lGzv%c|'"''
+        vimCommandLine.${term}
       ];
     };
   };