fixes the icon on the final "begin mapping" dialog of the walkthough
because of recent changes of the sprite.svg image, the dialog did accidentaly show the google plus logo.
Fix walkthrough
Merge pull request #1739 from tyrasd/patch-1737

Fix loading graph of unserialized objects. Fixes walkthrough
Merge pull request #1740 from tyrasd/patch-after-walkthrough

Fixes the icon on the final "begin mapping" dialog of the walkthough