grab: Re-enable DeviceUngrabDropsEmulatedEvents test

This test been fixed in
xorg/xserver!583.
3 jobs for reenable-device-ungrab-drops-emulated-events in 1 minute and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Prep
passed #7323084
container-prep

00:00:12

 
  Install Xserver
passed #7323085
xserver-build

00:00:52

 
  Build
passed #7323086
build

00:00:19