test: fix the pressure offset tests
Unsuprisingly, a normalized [0,1] value will always be between 0 and 1, so
bhis gave us a false positive. Check for the real values instead.
Those values aren't 100% correct because of a bug in the offset handling which
will be fixed in a follow-up commit. The difference is near enough that it
doesn't matter here anyway.
Signed-off-by:
Peter Hutterer <peter.hutterer@who-t.net>