opensafety: Use 1<<10 (not 2^10) in a #define;

   Comment out the #define since it's not actually used. :)

Change-Id: Ia34200d3eb705a74a33cbcf18175a7f780f2d2e2
Reviewed-on: https://code.wireshark.org/review/5128
Reviewed-by: Bill Meier <wmeier@newsguy.com>