[patch] fix the error I've introduced in the salinity from the DC

[Patrick Valsecchi]

Hi,

Bad, bad me.

libdivecomputer doesn't give the salinity in kg/l, but in g/l and
subsurface works with g/10l. So the salinity was too big by a factor
of 1000.

In attachment, you'll find the patch for that.

CU
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