e_comp_wl_input: when pointer is locked, delete cursor hide timer

e_comp_wl_input: when pointer is locked, delete cursor hide timer

When pointer is locked, no need to hide cursor by timer.
After applying this patch, the sequence flow is as follows.

1. mouse moves -> cursor hide timer added
mouse moves -> cursor hide timer updated

2. pointer locked -> delete cursor hide timer
mouse moves -> relative motion
mouse moves -> relative motion

3. pointer unlocked
mouse moves -> cursor hide timer added
mouse moves -> cursor hide timer updated
mouse idles -> cursor hidden by timer

Change-Id: I982db4fb2ed5742ef51c007394cf30ca684c7071