miku(mpv): Also play on DP-2

hosts/miku.nix

@@ -58,7 +58,8 @@
     programs = {
       #bluray.enable = true;
       mpv = {
-        primaryScreen = "C27F398"; enable = true;
+        primaryScreen = "DP-2";
+        enable = true;
       }; 
       sway.enable = false;
       alacritty.enable = true;