Remove unwanted timeout fallback to Legacy GA

When Provider dies, remove timer callback to avoid secondary timeout
fallback to Legacy GA that was leading to the dialog box blinking.

Bug: 272173191
Test: manual
Change-Id: Ie8d8dda855324a49c6b03e8d5f382f8d911050ba
Signed-off-by: Fabio Iannaccone <fabio.iannaccone@technicolor.com>