Virtual Board Mouse leave should release a button

[wischi-chr]

Reproduce:

• Press virtual button down with LMB
• Mouse mouse outside the button hit-scan area
• Release LMB
• Note that the virtual button is still pressed

Expected

• Press virtual button down with LMB
• Mouse mouse outside the button hit-scan area
• As soon as the cursor leaves the button area, the virtual button should be released.

[wischi-chr]

fixed