Bugfix/update dump response 8.0.3

• Bug fix for dump_response program

• Ensure dump_response has the fft dependency

Adds a couple of small fixes to ensure the dump_response program can compile. Also requires fixes contained in PR #235.

Currently still seems to be an issue with dump_response for field_option = “implicit” and this is under investigation. The issue arises in simulations running in ballooning space (i.e. any grid_option in kt_grids_knobs that is not “box”). This is because it makes use of the itright array from dist_fn which is only setup when initialising the connected boundary conditions. I think it should be possible to fix this relatively easily by just doing something different if itright has not been allocated.