Added compatibility for lua events API change 6.2.1.

tools/executable_manager.lua

@@ -37,6 +37,7 @@ du.check_min_api_version("5.0.0", "executable_manager")
 local PS = dt.configuration.running_os == "windows" and "\\" or "/"
 
 local gettext = dt.gettext
+local CURR_API_STRING = dt.configuration.api_version_string
 
 gettext.bindtextdomain("executable_manager",dt.configuration.config_dir.."/lua/locale/")
 
@@ -214,7 +215,7 @@ if dt.gui.current_view().id == "lighttable" then
 else
   if not exec_man.event_registered then
     dt.register_event(
-      "view-changed",
+      CURR_API_STRING >= "6.2.1" and "executable_manager", "view-changed" or "view-changed" ,
       function(event, old_view, new_view)
         if new_view.name == "lighttable" and old_view.name == "darkroom" then
           install_module()