move the module from the generic 'Other' package category into the 'User interface' category (same as Vertical Tabs)

...as per tittle.

While one browses through their module list, they expect to find vt_default along with its 'parent' module. Besides, as also stated in the title, the 'Other' category is pretty generic and all modules that do not define a category in their .info file end up there. This causes a LOT of modules to clutter there.

PS: just in case you didn't know already, the 'package' setting is case-sensitive. So it should be: package = User interface and not package = User Interface, cause that would create an extra category.

PPS: such a small 1-liner edit in the vt_default.info file that I didn't bother to provide a patch ;)