Since r7266, it's been possible to get a hostname into Default Settings; but

Since r7266, it's been possible to get a hostname into Default Settings; but
plink did not cope gracefully with this -- it was not possible to override that
hostname on the command line (attempts at doing so would be treated as part of
the remote command).
Fix this by applying the principle of r7265: if the user didn't explicitly
specify that they wanted to launch the hostname in the default (for instance
with '-load "Default Settings"', we assume they don't want to, and such a
hostname doesn't count when deciding whether to treat a non-option argument as
hostname or command.

git-svn-id: svn://svn.tartarus.org/sgt/putty@8651 cda61777-01e9-0310-a592-d414129be87e