[script_manager] updated register_event syntax to API 7.0.0

Author: wpferguson

tools/script_manager.lua

@@ -1145,7 +1145,7 @@ if dt.gui.current_view().id == "lighttable" then
 else
   if not sm.event_registered then
     dt.register_event(
-      "view-changed",
+      "script_manager", "view-changed",
       function(event, old_view, new_view)
         if new_view.name == "lighttable" and old_view.name == "darkroom" then
           install_module()