[algorithms][serializers] Set beat_core_class correctly

beat/web/algorithms/serializers.py

@@ -49,7 +49,7 @@ from .models import Algorithm
 class AlgorithmCreationSerializer(CodeCreationSerializer):
     class Meta(CodeCreationSerializer.Meta):
         model = Algorithm
-        beat_core_class = beat.core.algorithm
+        beat_core_class = beat.core.algorithm.Algorithm
 
 
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