add wireplumber fix

https://www.reddit.com/r/linux/comments/1em8biv/psa_pipewire_has_been_halving_your_battery_life/

thanks vaxry :3

modules/services/pipewire.nix

@@ -18,7 +18,16 @@ in {
             alsa.enable = true;
             alsa.support32Bit = true;
             pulse.enable = true;
-            wireplumber.enable = true;
+            wireplumber = {
+                enable = true;
+                extraConfig = {
+                    wireplumber.profiles = {
+                        main = {
+                            monitor.libcamera = "disabled";
+                        };
+                    };
+                };
+            };
         };
 
         security.rtkit.enable = true;