Since ScInterpreter::IterateParameters() iterates over just one range,
there's no point to to set flags for that range and then generically
walk over that range, just directly use the range.

Change-Id: I13003eb09bd98f145e9ead5e485596168d9399cb
Reviewed-on: https://gerrit.libreoffice.org/60866
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>