Imaging override parameters with chunked image handler

[e-koch]

From @astrojysun:

There isn't a "check_override" keyword here: https://github.com/astrojysun/phangs_imaging_scripts/blob/js_dev/phangsPipeline/handlerImagingChunked.py#L761

But we do have that for the imaging handler here: https://github.com/astrojysun/phangs_imaging_scripts/blob/js_dev/phangsPipeline/handlerImaging.py#L541