There were two booleans that could be merged into the flag word.
This also fixes a bug with CHAN_NOSTOP not working for local sounds because it checked the wrong sound source for the playing sound.
This was always used with 'consoleplayer' which really is the only thing making sense here. But this is a part of the global state which should be avoided in play code.
In particular, this makes no real sense in case of secondary maps where it should always return false.
# Conflicts:
# src/fragglescript/t_func.cpp
# src/g_inventory/a_keys.cpp
# src/p_acs.cpp
# src/p_mobj.cpp
# src/p_user.cpp
# src/r_data/r_interpolate.cpp
# src/r_data/r_interpolate.h
