fish: setup: Disable colouring in log and debug output for GStreamer

fish/.config/fish/conf.d/setup.fish

@@ -60,6 +60,9 @@ function __fish_setup_on_tty_login --description "Set up environment on tty logi
   set -gx CLICOLOR 1
   set -gx LSCOLORS 'gxfxcxdxbxegedabaggxgx'
 
+  set -Ux GST_DEBUG_NO_COLOR 1
+  set -Ux GST_DEBUG_COLOR_MODE "off"
+
   # Start all tmux sessions on login
   ~/.tmux/session-setup.sh
 end