Table: remove reflow CSS hack for Safari <= 5

It causes problems with assistive technology not being able to detect tables.

This effectively reverts bafa5d95d1ae2f028749c710aa198b96de7eeb3d, thus
removing the fix for gh-5380.

(cherry picked from commit 71c823e81ce48ef9bb4d314dc9d8381ba182760f)

Closes gh-6584
Fixes gh-6583
Re gh-5380