#339 Remove combobox from new member function/variable

[Reijo Tomperi]

Remove combobox from "new member function/variable"
where return type for function is selected. Is is not
usefull and it slows down the creation by jumping on
the screen when writing the return type there.

This is why:
- Not all possible return types are listed there and it
would be impossible to list them anyway, so this
doesn't give the normal combobox advantage, which is
"verifying the user input to be correct".
- As explained, it slows down the advanced users which
like to write the return type by hand from the keyboard.
- Newbies don't get advantage from it either, because
they either know the return types or they don't know
what they mean.

Note that currently the "new member variable" also has
"return type", while it should have "variable type".
But you should know what combobox I'm talking about.