Remove old re-indexing code from the stills indexer.
Remove old re-indexing code from the stills indexer.

This code wasn't called if indexing without a target.  Now, if indexing with a target, the reflections are mapped to the higher symmetry in choose_best_orientation_matrix instead, so this code is redundant.

dials/dials,dials/dials,dials/dials,dials/dials,dials/dials