Modifying the post build script.

Modifying the post build script.

[Issue] Self testing.

[Problem] NUIGadgetResourceManager.GetString(String name) was getting null for newly installed gadgets in Settings app.
[Cause & Measure]
 Cause : As defined by the FW team, DLL directories should be "res/allowed/<res-type>" rather than "res/allowed" to get the resources properly.
 Measure : Changed the post build script accordingly to store the resources files in proper destination

Change-Id: I7ed98b48c7e8db20476bda3c04f1786c4ac25fa3
Signed-off-by: azijur-r <azijur.r@samsung.com>