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.
1 job for work/fvogt/fixes in 4 minutes and 12 seconds (queued for 16 seconds)
Status Name Job ID Coverage
passed build_clazy_clang_tidy #142796