Change rendering of Multi BLD cutoffs + qualifications to ">= N points"

[timreyn]

Followup to #6301

Competitions such as https://www.worldcubeassociation.org/competitions/WC2017#competition-events list the cutoff for Multi Blind as "> 9 points". I suspect this would be clearer to most people if it said "at least 10 points". While for time-based events I don't think that <= or < is that much better than the other (and certainly not a big enough difference to be worth switching), for Multi Blind I would expect that most people would describe that cutoff as "10 points" rather than "more than 9 points".

This should change both in the edit events page, and in the events table. This could be done without a change to WCIF spec, just changing the way it's displayed.