hf_cc_loss is supposed to be a floating-point value, divided by 65535.

That's what the code did when it used proto_tree_add_text(); make it do
so now.  That squelches a run-time error.

Reformat the script-added hf_ values while we're at it.

Change-Id: I48d16280c523faa3b266e8df37f5e0e0b2827712
Reviewed-on: https://code.wireshark.org/review/5270
Reviewed-by: Guy Harris <guy@alum.mit.edu>