Fix multiple top-level definitions of enum Roles breaking ODR

src/multidayincidencemodel.cpp:11:6: warning: type 'Roles' violates the C++ One Definition Rule [-Wodr]
src/hourlyincidencemodel.cpp:8:6: note: an enum with different value name is defined in another translation unit

Just move the enums into class scope in the header files.
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passed build_clazy_clang_tidy #142796

00:04:12