[FIX] hw_scale: Adam scale wait time

When opening the weight screen in PoS it can take up to 10 seconds
until the weighting starts. This can be resolved by using a
Threading.Event instead to reset the 10 second sleep time.

Using exit_flag.wait(timeout=DELAY) will be more responsive, because
you'll break out of the while loop instantly when exit_flag is set. With
time.sleep(timeout=DELAY), even after the event is set, you're going to wait around in
the time.sleep call until you've slept for DELAY seconds.

closes odoo/odoo#32389

Signed-off-by: Olivier Dony (odo) <odo@openerp.com>

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