Increase minimum because IE is special

[This
spec](https://github.com/mootools/mootools-more/blob/master/Specs/Element/Element.Position.js#L148-L156)
is broken in IE7 becasue of IE adds starnge margins on top. So raising
the minimum 5px makes the specs do its job.

Thanks kentaromiura for teaching me some IE history
Merge pull request #1249 from SergioCrisostomo/spec-fix-IE-minimum-position

Increase minimum because IE is special