Remove debugging line

CURA-4284

plugins/CuraEngineBackend/StartSliceJob.py

@@ -334,8 +334,6 @@ class StartSliceJob(Job):
             self._addRelations(changed_setting_keys, instance.definition.relations)
             Job.yieldThread()
 
-        Logger.log("d", "changed_setting_keys=%s", changed_setting_keys)
-
         # Ensure that the engine is aware what the build extruder is.
         if stack.getProperty("machine_extruder_count", "value") > 1:
             changed_setting_keys.add("extruder_nr")