dot_zshrc.tmpl: remove MOZ_ENABLE_WAYLAND

As of Firefox 121 and Thunderbird 128 Wayland is the default so we
do not need these anymore.

dot_zshrc.tmpl

@@ -29,10 +29,6 @@ if [[ "$OSTYPE" =~ ^linux.*$ ]]; then
     [[ ! $PATH == *.local/bin* ]] && PATH=~/.local/bin:$PATH
 
     {{ if or (eq .chezmoi.hostname "knafeh") (eq .chezmoi.hostname "balozi") }}
-    # Export these variables in our TTY so that Sway can read them when it
-    # starts. It's not pretty, but it's all we can do since support for
-    # ~/.pam_environment was removed from pambase in Arch Linux recently.
-    export MOZ_ENABLE_WAYLAND=1
     # 2021-06-22: fix "Firefox is already running" message
     # See: https://mastransky.wordpress.com/2020/03/16/wayland-x11-how-to-run-firefox-in-mixed-environment/
     export MOZ_DBUS_REMOTE=1