Rename css file in GWT plugin archetype

The old name ('hello.css') doesn't fit to any plugin which is why this
file needs to renamed after a project has been generated. The new name
('plugin.css') is more suitable and doesn't need to be changed.

Change-Id: Ib5d132a9518f3faa29b85e35117c81d864f90323
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
2 files changed