Show pointer cursor for sortable table headers
Show pointer cursor for sortable table headers

This gives better affordance to the table headers, making it more
obvious that they can be interacted with.

Change-Id: Ibc43e08a75cc4d68f0ccbf11076b98e5078a33fc
Reviewed-on: https://gerrit.causes.com/26986
Reviewed-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>
Tested-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>

causes/twigg,causes/twigg