Use port from config

[dufferzafar]

Port 5600 is hardcoded, but should be read from the server config file:

aw-qt/aw_qt/trayicon.py

Line 90 in 7c5c447

self.root_url = "http://localhost:{port}".format(port=5666 if self.testing else 5600)

Usecase:

My brother & I both use activitywatch on our common PC. His aw-server process runs on port 5600, while mine runs on port 5700. When launching the dashboard from trayicon, it always opens up port 5600!