BS-14273 improve generation guidance

remove button field to make it local variable

bundles/plugins/org.bonitasoft.studio.contract/src/org/bonitasoft/studio/contract/ui/wizard/CreateContractInputFromBusinessObjectWizardPage.java

@@ -89,9 +89,6 @@ public class CreateContractInputFromBusinessObjectWizardPage extends WizardPage
     private String rootName;
     private final Contract contract;
     private final BusinessObjectModelRepositoryStore businessObjectStore;
-
-    private Button manuallyDefinedOperationButton;
-    private Button autoGeneratedOperationButton;
     private EMFDataBindingContext dbc;
     private final GenerationOptions generationOptions;
     private SelectObservableValue actionObservable;
@@ -147,8 +144,8 @@ public class CreateContractInputFromBusinessObjectWizardPage extends WizardPage
         final Image img = d.getSystemImage(SWT.ICON_WARNING);
         reminder.setImage(img);
         reminder.setLayoutData(GridDataFactory.fillDefaults().hint(600, SWT.DEFAULT).create());
-        autoGeneratedOperationButton = new Button(composite, SWT.RADIO);
-        manuallyDefinedOperationButton = new Button(composite, SWT.RADIO);
+        final Button autoGeneratedOperationButton = new Button(composite, SWT.RADIO);
+        final Button manuallyDefinedOperationButton = new Button(composite, SWT.RADIO);
         actionObservable = new SelectObservableValue(Boolean.class);
         actionObservable.addOption(Boolean.TRUE, SWTObservables.observeSelection(autoGeneratedOperationButton));
         actionObservable.addOption(Boolean.FALSE, SWTObservables.observeSelection(manuallyDefinedOperationButton));