Re-order the constants in the dc_deco_type_t enum.
Re-order the constants in the dc_deco_type_t enum.

The SAFETYSTOP is conceptually somewhere in between the NDL and the
DECOSTOP, so it makes sense to re-order the constants in the enum to
reflect this order.

josh-wambua/libdivecomputer,venkateshshukla/libdivecomputer,henrik242/libdivecomputer,Poltsi/libdivecomputer-vms,glance-/libdivecomputer,glance-/libdivecomputer,venkateshshukla/libdivecomputer,henrik242/libdivecomputer,josh-wambua/libdivecomputer