edje: initialize map.zoom values to fix old *.edj compatibility issues.

edje: initialize map.zoom values to fix old *.edj compatibility issues.

Summary:
The initial values for map.zoom.x(y) should be [1.0]: it means 100%.
The values from newly builded edj has been set properly.
But, if a part from old *.edj turns on map feature, map.zoom.x(y) will be set [0.0]: it means 0%.
So, the part will be invisible. We need to initialize these values.
@fix

Test Plan:
1. Build a *.edc file which has a part with [description.map.on: 1;] in EFL 1.13.
2. See it works well in EFL 1.13.
3. Install EFL 1.14 or laters.
4. See the part is disappear.

Reviewers: Hermet, jpeg, cedric

Reviewed By: cedric

Subscribers: jiin.moon

Differential Revision: https://phab.enlightenment.org/D3302

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>