rtkfdk shows proper Parker weighting warning when selecting CUDA as hardware but not CPU

[ZijunH]

When using the RTK coupled with Insight version 5.0.0, using rtkfdk gives a warning "You do not have enough data for proper Parker weighting (short scan) Delta is 10 degrees and should be more than half the beam angle". With the same parameters, this warning is only printed with --hardware cuda. This does not appear with --hardware cpu.

Note: This could be a duplicate of Issue #118. However, due to the lack of information provided in the other post, I am not too sure.