[TIZEN] Manage the package  update correctly

Call platform_installer.UpdateApplication() instead of  platform_installer.InstallApplication()

BUG=XWALK-2782

Signed-off-by: Baptiste DURAND <baptiste.durand@open.eurogiciel.org>
Merge pull request #2529 from eurogiciel-oss/XWALK-2782

[TIZEN] Manage the package  update correctly