control.anchor needs a ControlBox (#748 cont'd)
control.anchor needs a ControlBox (#748 cont'd)

Apparantly, `control.anchor` doesn't function appropriately in any of the
`FormBorderStyle.Fixed*` modes when the ControlBox (close button) is
disabled. This means that run-time font remapping was still causing issues
in certain circumstances. As such, add back the ControlBox to get this to
behave sanely.

jeoffman/EDDiscovery,mwerle/EDDiscovery,jgoode/EDDiscovery,jeoffman/EDDiscovery,jthorpe4/EDDiscovery,jgoode/EDDiscovery,mwerle/EDDiscovery