[Bug-xnee] Reset when synchronisation fails

[Ole Tange]

I have now gotten this error a few times:

Can't synchronize anymore .... have to leave!  11 10
Error number: 5
  Error:      Synchronisation filure
  Solution:   For more information on this error, please read the manual(s)

After this the keyboard is in an undefined state. Sometimes ALT or
SHIFT is hold down and autorepeat is killed.

xnee should always reset the keyboard to the state at the start.

/Ole