Eject file name in disc menu not updated

[LoveBug2084]

If you have a disc already loaded and then choose new disc from the disc menu without previously ejecting the old disc then a new disc is created and loaded into that drive but the eject disc still shows the previous disc filename in the menu instead of the new disc thats currently loaded

[SteveFosdick]

See https://github.com/stardot/b-em/commit/7977170204f38188620ae9b95699ba95d492bbad