OSPF : cleanup hf_filter array

hf_filter array was removed. Compiles, did some manual testing and didn't see any regression. Bitfield still not changed over to inbuilt functions

Change-Id: I510da6160c0f2375398b9ab30042ff172ae31c9f
Reviewed-on: https://code.wireshark.org/review/3147
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Alexis La Goutte <alexis.lagoutte@gmail.com>