trivial: synapticsmst: remove unneeded fixme
trivial: synapticsmst: remove unneeded fixme

The opening flow for enumerate is as expected right now.

hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,hughsie/fwupd,fwupd/fwupd,vathpela/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,vathpela/fwupd