utils: Fix Google Meet URL template

The Google Meet URL is extracted from the Calendar Event Notes by using a substring with a fixed length. This length is too short by 1 character.

In order to get the right URL the substring needs to be 1 character longer. In order to match the Google Meet URL add an "x" in the given URL pattern.

Fixes GNOME/gnome-calendar#749
1 job for 749 in 8 minutes and 28 seconds (queued for 7 seconds)