Fix display of ECC keys in the Windows Pageant list box.

Fix display of ECC keys in the Windows Pageant list box.

This is an absolutely horrible piece of code, relying not only on font
metrics but also on an observed correlation between the length of a
key algorithm name and whether or not it needs a separate key size
displayed. But it'll do for the moment, and it's less effort than
writing a custom piece of Windows API code to display the list box
entries in a properly robust way :-(