Dont try to reverse lookup lat/lng

If people already specify a latitude/longitude value, don't try to reverse
lookup it, because it may lead to relevant offsets.
For instance: 46.043118, 8.810928 is converted to
46.05832, 8.80685, which is 1.7 Km (more than 1 mile) away.
Merge pull request #1694 from mlocati/fix-maps-latlng

Dont try to reverse lookup lat/lng