XML Import timer was not disabled when the MDI was disabled

Certain processed, e.g. running Account Processed disable the MDI (main finPOWER Connect) interface and also prevent timers such as the Task Manager alert from running.

The timer related to checking for XML files to import (as defined under User Preferences, Accounts, Import) was not disabled which could lead to incorrect error messages appearing, e.g., if the import folder did not exist.