BUG/Suggestion: Map changes to default when refresh is hit

**Steps to reproduce**:
1. Enter the main map page.
2. Change the map type to OSM. Now the map changed to OSM.
3. Refresh the page. Now the map has changed back to Dark. 

**Desired behaviour**:
The map should sustain the selected type, even after refresh. This can be achieved by storing cookies, for example.