fix: use existing provenanceManager instance in CrateWriter for provenance information

Author: Pfeil

src/main/java/edu/kit/datamanager/ro_crate/writer/CrateWriter.java

@@ -48,7 +48,7 @@ public void save(Crate crate, DESTINATION_TYPE destination) throws IOException {
         Validator defaultValidation = new Validator(new JsonSchemaValidation());
         defaultValidation.validate(crate);
         if (this.provenanceManager != null) {
-            new ProvenanceManager().addProvenanceInformation(crate);
+            this.provenanceManager.addProvenanceInformation(crate);
         }
         this.strategy.save(crate, destination);
     }