Disable gas change events except for the intial mix.
Disable gas change events except for the intial mix.

For the IQ-700, the existing code for the active gas mix always results
in an out-of-range gas mix index. The index of the active gas mix is
probably stored in another bit. As a temporary workaround, we simply
assume the active gas mix is always the first gas mix. This should
already produce correct results for dives with only single gas mix.

glance-/libdivecomputer,Poltsi/libdivecomputer-vms,henrik242/libdivecomputer,henrik242/libdivecomputer,glance-/libdivecomputer