Apply the same fix in function TestShutter::AddShutteritem than in guitest.C.

The new function API is
void TestShutter::AddShutterItem(const char *name, shutterData_t *data)
instead of:
void TestShutter::AddShutterItem(const char *name, shutterData_t data[])
The new form is more portable and works correctly with CINT too.


git-svn-id: http://root.cern.ch/svn/root/trunk@21249 27541ba8-7e3a-0410-8455-c3a389f83636