[private-bamoe-issues#2091] Fix ActionFieldValue clone

Author: Gabriele-Cardosi

drools-workbench-models/drools-workbench-models-guided-dtable/src/main/java/org/drools/workbench/models/guided/dtable/backend/util/GuidedDTBRDRLPersistence.java

@@ -337,7 +337,7 @@ public void visitActionCallMethod(final ActionCallMethod action) {
                     final ActionFieldFunction afvClone = new ActionFieldFunction();
                     afvClone.setMethod(((ActionFieldFunction) fieldValue).getMethod());
                     afvClone.setField(fieldValue.getField());
-                    afvClone.setNature(BaseSingleFieldConstraint.TYPE_LITERAL);
+                    afvClone.setNature(fieldValue.getNature());
                     afvClone.setType(fieldValue.getType());
                     String value = fieldValue.getValue();
                     String templateKeyValue = rowDataProvider.getTemplateKeyValue(value);

drools-workbench-models/drools-workbench-models-guided-dtable/src/test/java/org/drools/workbench/models/guided/dtable/backend/BRLRuleModelTest.java

@@ -1384,7 +1384,7 @@ public void testActionCallWithTemplateKeys() {
                 "when\n" +
                 "  x : Context( )\n" +
                 "then\n" +
-                "  x.add( \"test\" );\n" +
+                "  x.add( @{test} );\n" +
                 "end\n";
 
         assertEqualsIgnoreWhitespace(expected,