Gas usage statistics: don't require gas switch events

Our "get_has_used()" helper only filled in gas usage for cylinders that
had a gas change event associated with them.  That works really badly
for things like CCR, but also simply for cases where the dive computer
wasn't necessarily explicitly notified about usage, like sidemount
diving etc.

Just remove the logic.  If some use ends up particularly wanting to
ignore some cylinder, they can always do it in the caller instead.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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