"Roles" is a C-style enum (i.e. not C++-style enum class). Since that
means that the names spill into the outer namespace, the names
themselves are prefixed with "Role". Nevertheless the code qualified
the names with "Roles::". This is redundant and unnecessary.
Remove this redundancy to show that we understand how the language
works.
Note: we could also transform the enum into an enum class and remove
the "Role" prefix from the names. That would arguably be "cleaner",
but then the enum doesn't auto-convert to/from int, but Qt uses int
to pass the roles to functions. So let's go the simple way that
avoids casting.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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