NIFI-13924 Fixed NiFi CLI delete-param command (#9440)

Signed-off-by: David Handermann <[email protected]>

Author: pvillard31

nifi-toolkit/nifi-toolkit-cli/src/main/java/org/apache/nifi/toolkit/cli/impl/command/nifi/params/DeleteParam.java

@@ -83,6 +83,7 @@ public VoidResult doExecute(final NiFiClient client, final Properties properties
         parameterDTO.setValue(null);
         parameterDTO.setDescription(null);
         parameterDTO.setSensitive(null);
+        parameterDTO.setReferencedAssets(null);
 
         final ParameterEntity parameterEntity = new ParameterEntity();
         parameterEntity.setParameter(parameterDTO);