[Qt-creator] Adding new designer form class doesn't honour file naming conventions

[Robert Caldecott]

In the C++ File Naming Convention options page I have the 'Lower case
file names' option toggled off.  When I add a new C++ class the wizard
will honour this, so adding a class called Foo will generate Foo.cpp
and Foo.h.

However, adding a new designer form class always results in lower-case
file names.  Adding a class called FooDialog will generate
foodialog.cpp, foodialog.h and foodialog.ui the 'Lower case file
names' option is being ignored.