e/conf_apps: Fix resizing of "Startup Application" dialog
e/conf_apps: Fix resizing of "Startup Application" dialog

Summary:
Currently the config dialog in Apps > Startup Applications does not properly
resized as one of the objects is not set to horizontal fill.

Test Plan: 1. Resize "Apps > Startup Applications", it should resize the list with the window

Reviewers: zmike

Subscribers: cedric, seoz

Differential Revision: https://phab.enlightenment.org/D3296

tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,tasn/enlightenment,rvandegrift/e,tasn/enlightenment,rvandegrift/e