TimeInput expert: Updating input extender content only when active

Removed obsolete "eachchange" event handler since its actions were redundant with the
"timeinputupdate" event handler. The input extender contents are updated only when the
input extender is active preventing running into errors when the input extender contents
could not be accessed.

Change-Id: Icb8474dc4995b2b02dbf52a42626947b15961c1a