Increase timeout for "Application in not responding" prompt

[joebonrichie]

Currently the default timeout for application is not responding prompt is waay to low and aggressive. For a lot of larger applications where load times are single thread bound (older games!) this timeout can be reached quite easily.

The gsettings location is: /org/gnome/mutter/check-alive-timeout

I think increasing from the default from 5000ms to 10,000ms or 12,000ms would be a good value.