fdo#63154 Remove unused solar.h reference in sc

Change-Id: I160f7af515d0a42f20fbc694fff7f39567ebeec5
Reviewed-on: https://gerrit.libreoffice.org/8062
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>