BUG #14233. Fix enable state for disconnect button.

Disconnect button was remaining disabled if the user cancelled the disconnect
action. Fixed that.

Change-Id: I38ea6adf9b8353c48c32169a86e0404d3ccb3fb1
Merge topic '14233_fix_disconnect_button' into next

3ba4779 BUG #14233. Fix enable state for disconnect button.