[fish] Remove $CLIENT, display machine name instead.

home/.config/fish/functions/fish_prompt.fish

@@ -1,4 +1,10 @@
 function fish_prompt
+	# Just calculate this once, to save a few cycles when displaying the prompt
+        # (Stolen from vendor fish_prompt())
+	if not set -q __fish_prompt_hostname
+		set -g __fish_prompt_hostname (hostname|cut -d . -f 1)
+	end
+
         switch (hostname -s)
                 case tdhtest
                         set logo "🐮"
@@ -8,9 +14,7 @@ function fish_prompt
                         set logo "?"
         end
 
-        if not [ -z $CLIENT ]
-                echo -n "[$CLIENT] "
-        end
+        echo -n "[$__fish_prompt_hostname] "
 
         set_color blue
         echo -n $logo (pwd)