fix equalsAscii conversion. Noticed in fdo#72391

In commit 363cc397172f2b0a94d9c4dc44fc8d95072795a3
"convert equalsAsciiL calls to startWith calls where possible"
I incorrectly converted equalsAsciiL calls to startsWith calls.
This commit fixes those places to use the == OUString operator.

Change-Id: If76993baf73e3d8fb3bbcf6e8314e59fdc1207b6
Reviewed-on: https://gerrit.libreoffice.org/7008
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>