[0.14.12] [rrrola] 'Check updates' button not stopping press-event

[matjojo]

To reproduce:

• press 'about'
• press 'check for updates'
• update if needed
• when updated, press 'check for updates'
• notice comes up, press OK
• see that the press-animation (orange colour) does not disappear, even after mousing over

Specs:

• CPU: I3-45005U
• GPU: IntelHD 4600
• OS: windows 10 (anniversery update installed)

EDIT: to fix ingame

• press the button again
• grab the notice(click and hold the frame caption)
• put it so that the OK button is over the 'chek updates' button
• press OK
• it's now grey again

[Jan Kadlec]

Fixed for 0.14.17.