Remove maxwell_fields from regression tests as the syntax has changed
Description
This MR fixes the broken output for the MaxwellFieldsCoordinate block. Now an arbitrary number of points can be given in the block and also the components of total, longitudinal, and transverse E and B fields can be selected independently for output.
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Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Closes #470 (closed)