'Save image' and 'Save link' doesn't work on context menu

'Save image' and 'Save link' doesn't work on context menu

[Problem]  Nothing happened after invoke 'Save image' and 'Save link'
commands from context menu. No message, no file is saved.
[Cause]    Paths for downloads were set wrong on Tizen v3.0.
[Solution] Set proper paths for given platform.

From now on, 'libtzplatform-config' library will be used to get
proper patch on Tizen v3.0.

Original beta/m42 patch: http://165.213.202.130/gerrit/#/c/84031/

Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=13984

Reviewed by: a.renevier, a1.gomes, sns.park

Change-Id: I00f9fcaff8e2f0786e9913a92d25e871f91a590b
Signed-off-by: p.niemirski <p.niemirski@samsung.com>