fix audiolink laser handling in VRSL_ManagerWindow.cs

If there is an audiolink laser in the scene and the user either:
- Tries to `Update Fixtures` in the VRSL
- Tries to open an audiolink band
The console will print and error or spam errors respectively.

This change prevents the errors without functionality.

Packages/com.acchosen.vr-stage-lighting/Editor/VRSL_ManagerWindow.cs

@@ -577,9 +577,9 @@ public void ApplyChanges(VRStageLighting_AudioLink_Laser li)
         laser.ApplyProxyModifications();
         #pragma warning restore 0618 //suppressing obsoletion warnings
 
-        if(PrefabUtility.IsPartOfAnyPrefab(light))
+        if(PrefabUtility.IsPartOfAnyPrefab(laser))
         {
-            PrefabUtility.RecordPrefabInstancePropertyModifications(light);
+            PrefabUtility.RecordPrefabInstancePropertyModifications(laser);
         }
     }
 
@@ -4193,6 +4193,10 @@ void OnGUI() {
                                         EditorGUILayout.EndFoldoutHeaderGroup();
                                     }
                                 }
+                                if(fixture.isLaser && PrefabUtility.IsPartOfAnyPrefab(fixture.laser))
+                                {
+                                    PrefabUtility.RecordPrefabInstancePropertyModifications(fixture.laser);
+                                } else
                                 if(PrefabUtility.IsPartOfAnyPrefab(fixture.light))
                                 {
                                     PrefabUtility.RecordPrefabInstancePropertyModifications(fixture.light);