popup: add popup default scrollable flag config for other profiles.

popup: add popup default scrollable flag config for other profiles.

Summary:
The default scrollable flag of popup can be different in each profiles.
So I added the scrollable configuration of popup.
@feature

Test Plan:
1. Before
 1) elementary_test -to popup
 2) resize window to smaller
 3) Click 15th item, "popup-center-title + genlist content + 1 button"
 4) Then popup will show, but its list is very long, only small part of popup could be shown.

2. After Patch
 1) change "popup_scroller" value to 1 in base.src, then run elementary_test -to popup or ELM_POPUP_SCROLLABLE=1 elemantary_test -to popup
 2) resize window to smaller
 3) Click 15th item, "popup-center-title + genlist content + 1 button"
 4) Then popup will show, popup's genlist will be in scroller, so entire popup can be shown.

Reviewers: jaehwan, id213sin, cedric, raster, singh.amitesh, SanghyeonLee, Hermet

Subscribers: Hermet, minkyu, herb, jpeg

Differential Revision: https://phab.enlightenment.org/D3856