Re #1790 Partially fix issue with unique IX_detector_array container,…

… comparing detectors on the basis of their positions and not the name of the file, they are obtained from.

herbert_core/classes/instrument_classes/instrument/detectors/@IX_detector_array/IX_detector_array.m

@@ -598,8 +598,10 @@
         end
         function flds = hashableFields(~)
             % Return cellarray of properties defining the class hash for
-            % comparison
-            flds = {'det_bank', 'filename'};
+            % comparison. Filename and filepath should not be used in
+            % hashes as detectors retrieved from different experiment files
+            % are usually the same.
+            flds = {'det_bank'};
         end
 
         function flds = saveableFields(~)