The order of ui-application element in manifest.xml is changed

The order of ui-application element in manifest.xml is changed

[Issue#] P131004-00766
[Problem] The dbox execution file is selected to the main UI application by package manager
[Cause] The order of ui-application element is wrong.
        The dbox execution file is first. And the main web application execution is second.
        The first is set to main ui-application by package manager.
[Solution] The order of ui-application element in manifest.xml is changed.
           But this is the temporary solution.
           The final solution is that the 'mainapp=true' is set in to the main ui-application element.
           Therefore, this commit must be updated with the final solution.

Change-Id: I34445ce0571453cc9c554efb2cabc8d245117cdf