Kaisuke Nakajima points out that it's unnecessary to translate

negative font sizes (meaning pixels) into positive ones (points) in
winstore.c, since it gets done anyway at the point of font creation;
and removing the code in winstore.c means that the precise font
entered by the user is saved in the config, rather than being
rounded.

git-svn-id: svn://svn.tartarus.org/sgt/putty@3755 cda61777-01e9-0310-a592-d414129be87e