fix: list correct dimension in ImagingTopoCluster (#1579)

### Briefly, what does this PR introduce?
This PR fixes an incorrect dimension in logging output.

### What kind of change does this PR introduce?
- [x] Bug fix (issue #__)
- [ ] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
No.

### Does this PR change default behavior?
No.

src/algorithms/calorimetry/ImagingTopoCluster.h

@@ -106,7 +106,7 @@ namespace eicrecon {
           break;
         case ImagingTopoClusterConfig::ELayerMode::xy:
           info("Neighbour layers clustering (same sector and layer id within +- {:d}: "
-               "Local [x, y] distance between hits <= [{:.4f}, {:.4f} rad].",
+               "Local [x, y] distance between hits <= [{:.4f} mm, {:.4f} mm].",
                m_cfg.neighbourLayersRange, layerDistXY[0], layerDistXY[1]
                );
           break;