Now when a saved session is loaded, its name appears in the

Now when a saved session is loaded, its name appears in the
IDC_SESSEDIT box, so that clicking Save will save over it. Useful
for people who want to load, modify, and re-save. Special case: this
doesn't apply to Default Settings, because I think people will be
more likely to load DS, modify it, and save under a _different_
name, so it's good not to allow a single mouse click to screw them
up.

git-svn-id: svn://svn.tartarus.org/sgt/putty@698 cda61777-01e9-0310-a592-d414129be87e