Fix CompareIgnoreCaseToAscii -> matchIgnoreAsciiCaseAsciiL regression

...introduced with 19ebc215d19ed9c7c5c6fdabf2f4acd5af02cbc4 "INTEGRATION: CWS
ineturl1: #i34006# modify INetURLObject to use rtl::OUString and
rtl::OUStringBuffer," where String::CompareIgnoreCaseToAscii returns
StringCompare but rtl::OUString::matchIgnoreAsciiCaseAsciiL return sal_Bool.

Change-Id: I009bd6f606850f4e971fda4a1b468e7b0d102685
Reviewed-on: https://gerrit.libreoffice.org/6635
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>