Force show tour wizard button
Force show tour wizard button

The tour wizard button remains hidden if they key was already set in the
browser's local storage. This fix removes the key test and shows the tour
button to those users also.

Fixes issue #247.

City-of-Helsinki/servicemap,City-of-Helsinki/servicemap,Zeukkari/servicemap,vaaralav/servicemap,vaaralav/servicemap,Zeukkari/servicemap,City-of-Helsinki/servicemap,vaaralav/servicemap