tests(smoke): allow for decimal in a11y tap target

[connorjclark]

in smokerider we get this:

✘ difference at target-size audit.details.items[0].node.explanation
expected: "/^Fix any of the following:\n {2}Target has insufficient size \([0-9]+px by [0-9]+px, should be at least 24px by 24px\)\n {2}Target has insufficient offset from its closest neighbor \([0-9]+px should be at least 24px\)$/"
found: "Fix any of the following:\n Target has insufficient size (8.9px by 17px, should be at least 24px by 24px)\n Target has insufficient offset from its closest neighbor (13.4px should be at least 24px)"