Show the newly split pressures correctly in the equipment page too

Show the newly split pressures correctly in the equipment page too

NOTE! When *editing* the cylinder data, the only thing shown is the
non-sample pressure.  So the cylinder editing widget will show zero for
start/end pressure for a dive that has pressure saples without any
manually set pressure data.

This is intentional, so that you can clearly see that this is not a set
value.  But it may be that we should gray out the spinputton and have an
"edit value" checkbox or something to make it really obvious.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>