spinner: crash issue on deletion fix

spinner: crash issue on deletion fix

Summary:
Issue: longpress timer callback if it gets called after widget deletion,  crash happens.
Solution: delete the long press timer in smart del function.
Signed-off by: Kumar Navneet (k.navneet@samsung.com)
Signed-off by: Shilpa Singh (shilpa.singh@samsung.com)

Test Plan: When we tap inc/dec fast and delete the widget immediately, crash might happen.

Reviewers: raster, seoz, Hermet

Reviewed By: Hermet

CC: govi, rajeshps
Differential Revision: https://phab.enlightenment.org/D669

@fix