Context menu only shows up once

Context menu only shows up once

When one long-presses links or images, a context menu
is to be shown for further user action. In our current
implementation, this was being done by making use of EFL
'genlist' widget.

As per the docs [1], 'genlist' is a widget aimed at being
used for sophisticated list content, with support to submenus,
runtime item modifications, etc.
Problem is that there seems to be a bug in EFL (affecting
even desktop), making the context menu to show always
an empty list for the second time it is invoked.

As a quick solution for the problem, patch replaces 'genlist'
by 'list'.

[1] https://docs.enlightenment.org/auto/elementary/group__Genlist.html

Original beta/m42 patch:
- http://165.213.202.130/gerrit/#/c/87251/ , reviewed by
Janusz Majnert, arno renevier.

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=6663

Reviewed by: a.renevier

Change-Id: I46efa39175d9ec9467db185cddd8347787a58607
Signed-off-by: Antonio Gomes <a1.gomes@samsung.com>