Remove invalid package dependency

Not sure what this is. Probably some debian packaging trick. We don't want
to do any 'clever' tricks anymore, so just remove it.

debian/control

@@ -6,7 +6,7 @@ Build-Depends-Indep: debhelper (>= 4.1.16)
 Standards-Version: 3.6.1
 Package: openvpn-server
 Architecture: all
-Depends: openvpn, openssl, nsis (>= 2.06-4), zip, ucf, ${misc:Depends}, bc, cryptsetup, ifstat, bsd-mailx, sharutils, bash-completion, at
+Depends: openvpn, openssl, nsis (>= 2.06-4), zip, ucf, bc, cryptsetup, ifstat, bsd-mailx, sharutils, bash-completion, at
 Description: A system to assist the management of OpenVPN servers
  Provides a simplified OpenVPN server configuration at installation time,
  and a set of scripts to automatically create Windows and Linux client