[gpm] [Patch] Make notifications more reliable at session startup

[Pramod Dematagoda <pmd lotr gandalf gmail com>]

Hello Richard,

This is a patch that addresses an earlier problem that seems to have
cropped up again, it does not do much except for replacing
gtk_status_icon_get_visible with gtk_status_icon_is_embedded as a way of
finding out if the status icon is visible to the user during session
startup. Also I removed the timeout relating to the old fix since it's
no longer necessary. :)

Cheers,
Pramod