Make parsing of Google Maps URIs more flexible

When opening a location in certain apps (like WhatsApp) the value of q
in the called URI is something like "loc:xx.xxxxxxx,x.xxxxxxx (Du) ".
Until now extract() expects "xx.xxxxxxx,x.xxxxxxx" as input and cannot
parse URIs like the one above.

Solve this problem by cutting off unnessessary peaces of the URI.