ApiFlowThank: Prevent thanking from Flow if partial blocked against thanks
ApiFlowThank: Prevent thanking from Flow if partial blocked against thanks

Die earlier from ApiFlowThank::execute if them user is blocked from
Thanks, now that it is possible to have a partial block against Thanks
without being blocked from pages.

Follow-up to Id86d97a38c041fea4abcdbdd404428622df76669

Bug: T242785
Change-Id: Ia3683c3cab333b1193b2b77c6c18b5c343b5a5c7

wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks