Fix glib import

After upgrading some packages hamster stopped working on my Debian sid system, which I traced down to the `import glib` line in `hamster-windows-service`. After changing it to use the GI repository everything seems to work fine again.

(I saw your comment in the [projecthamster wiki](https://github.com/projecthamster/hamster/wiki), so I guess this is as good a place as any to send a PR ;-) I added myself to the wiki as well since I'd also be interested in maintaining Hamster)