Minor bug: Restore background called when restore is null (Interaction Controller)

[johanwikstrm]

Try to resolve the bug where one ends up in a state where one tries to restore background even though the restore_ variable is null - it should rather be a blank initialized variable (doesn't crash game but we should not end up in this state!).

[robbanw]

We should end up in this state! restore background is called on every draw cycle but we are only setting a new restore surface when draw_indicator_ boolean is true, so naturally the restore surface will be null.

Please close this issue if you agree!