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Disable Preferences save button before setting change

Authored by Sn1per.

Description

Disable Preferences save button before setting change

Disable the Special:Preferences 'Save' button if no
settings have been changed (uses keydown and mousedown
events as an alternative to change event, so is not perfect)
This prevents unnecessary saving when you can't remember
if you saved the settings or not.

Bug: T89457
Change-Id: I7c2e11302099280c561e435425b23afb9fb760b5