Fix the length of the Suunto DX gas change event.
Fix the length of the Suunto DX gas change event.

The Suunto DX uses 5 bytes for the 0x06 gas change event.

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