evas canvas: fix not to trigger unnecessary events.

evas canvas: fix not to trigger unnecessary events.

Summary:
Here comparision is logically wrong because it compares
the coordinates(cur, prev) of the different spaces.

As you can see just above the conditions,
Cur coordinates could be transformed into the map space (if objs have)
on the otherhands, prev is not. These wrong condition could occur
embarassing event trigger.

@fix

Reviewers: #committers, zmike

Reviewed By: #committers, zmike

Subscribers: cedric, #committers, zmike

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6674

Change-Id: I401deade25fe890a3e2bddafd1b0a68f4e388dd2