sc: pivot table not correct when data and PT cache is not in sync

It can happen that the pivot table is not updated and the sheet
data is changed so much that it doesn't match the pivot table
cached definitions. This is a perfectly valid scenario and
nothing should be wrong (the pivot table can just be updated
once loaded).

At XLSX import we should always check the cached definitions,
because the pivot table description is made using the cached data,
not the actual data.

The issue can occur when looking up the name of a PT field we
however didn't check the cached definition but checked the
sheet data, so because the indices changed so much (many columns
were removed in the sheet data) we can not find the actual field
name. The solution is simple - get the field name from the cached
pivot table definition.

Change-Id: I3b5b33f33f3c484f0b66b97ac97200d9913edcfe
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163197
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

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