Default numeric column sorts to descending on first click

[dustinturp]

I have an idea to set the default to descending instead of ascending. When sorting by message count, unacked, disk used, or more, I like to see the ones with the highest count first. This requires 2 clicks at the moment. Sorting ascending first. Then another click to view descending.

For now the default ascending is great for sorting the queue / stream name. When identifying an issue sorting by desc in one of the numeric columns is one of my first moves.

I believe the sorting is based in /static/js/tableheadersort.js. There could be a way to preserve asc for text based columns and have desc for numeric columns.

Happy to open a pr if this is a desired feature enhancement.