adjust scale on IE

[tomtor]

On IE 11 the computed width (nr of columns) is too large.
I loose on average about 3 characters on the right side.

This is a quick hack to fix this.

[KLuka]

Thanks for the patch 👍 I will check this out as soon as I get access to some IE11 :)

[tomtor]

Note that somehow this whole computation is VERY browser specific.
Firefox width is more or less OK, Chrome is often too narrow (but that is only a cosmetic issue) and IE often too wide (loosing characters on the right is very annoying).

Most people will not notice, until you start eg "tmux" which has a status banner on the bottom of the screen.

[KLuka]

You are correct, there are a lot of differences between browsers when we are detecting terminal width. For Chrome we can even see this in gif from project README :) Maybe we can find solution that will work better for all major browsers, but for now I am pulling your patch in...

Thanks 👍