Update gamescope commands

Some flags were changed, also changed to verbose flags to make it easier
to parse in the future

hosts/gamescope.nix

@@ -1,8 +1,13 @@
 { config, lib, pkgs, ... }:
 let
-  sessionCommand = " gamescope -w 1920 -h 1080 -W 3840 -H 2160 -U -f -g -e -- steam -gamepadui";
-in
-{
+  sessionCommand = ''
+    gamescope\
+      --output-width 3840 --output-height 2160 --framerate-limit 60\
+      --nested-width 1920 --nested-height 1080 --nested-refresh 60\
+      --scaler auto --filter fsr --fsr-sharpness 10\
+      --hide-cursor-delay 5 --steam -- steam -gamepadui
+  '';
+in {
   imports = [ ./desktop.nix ];
   services = {
     blueman.enable = true;