fix [#25056] RuntimeError: Writing to ID classes in this context is not allowed

draw functions cant edit scene data now, these values are set in execute() so should not be set while drawing the menu.

io_export_unreal_psk_psa.py

@@ -1769,8 +1769,6 @@ class OBJECT_OT_UnrealExport(bpy.types.Operator):
 		return{'FINISHED'}    
 
 def menu_func(self, context):
-	bpy.context.scene.unrealexportpsk = True
-	bpy.context.scene.unrealexportpsa = True
 	default_path = os.path.splitext(bpy.data.filepath)[0] + ".psk"
 	self.layout.operator("export.udk_anim_data", text="Skeleton Mesh / Animation Data (.psk/.psa)").filepath = default_path