Fix return type of items() functions
This fixes this build error:
In file included from /home/tusooa/Code/communicator/build/communicator_autogen/CO7RNFV35A/moc_calllogs.cpp:10,
from /home/tusooa/Code/communicator/build/communicator_autogen/mocs_compilation.cpp:5:
/home/tusooa/Code/communicator/src/models/contacts/calllogs.h:39:21: error: conflicting return type specified for ‘virtual FMH::MODEL_LIST CallLogs::items() const’
39 | FMH::MODEL_LIST items() const override final;
| ^~~~~
In file included from /home/tusooa/Code/communicator/src/models/contacts/calllogs.h:10,
from /home/tusooa/Code/communicator/build/communicator_autogen/CO7RNFV35A/moc_calllogs.cpp:10,
from /home/tusooa/Code/communicator/build/communicator_autogen/mocs_compilation.cpp:5:
/usr/include/MauiKit/mauilist.h:53:36: note: overridden function is ‘virtual const MODEL_LIST& MauiList::items() const’
53 | virtual const FMH::MODEL_LIST &items() const = 0;