A transgender male (biological female) would see themselves as male. An actual male.
So if they were attracted to women, as a male (their correct self), they would likely consider themselves heterosexual.
But it can be complicated -
Elliot Page (bio female - girl from Juno) is a trans male that describes himself as queer. As Ellen Page he described himself as lesbian, and dated girls.
He now dates another transgender male (bio female) who also describes themself as queer. So 2 trans-masculine / non-binary (bio female), that both describe themselves as queer, dating one another.