Cleanup: remove ReverseGeoLookupThread

Fetching the taxonomy from GPS coordinates was implemented in
a QThread. But the only access to the main function was a
direct call to run(). Thus, the thread was *never* started.
The function call was always asynchronous [it was using an
event loop though, so the UI doesn't hang]. Notably this
means that the signals connected to the thread would never
fire. And the spinner would never be activated.

Thus:
1) Turn the thread into a simple function.
2) Remove the spinner.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

desktop-widgets/locationinformation.cpp

@@ -330,8 +330,7 @@ void LocationInformationWidget::resetPallete()
 
 void LocationInformationWidget::reverseGeocode()
 {
-	ReverseGeoLookupThread *geoLookup = ReverseGeoLookupThread::instance();
-	geoLookup->run();
+	reverseGeoLookup();
 	updateLabels();
 }