tests/setupwizard: remove .PHONY hack
tests/setupwizard: remove .PHONY hack

It doesn't appear to be needed any more...?  I wouldn't have added it just for
the lulz, but I can't seem to reproduce the problem I thought I had in
056d381450a5849015e3cc3a1114e411eab07837.

Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui