fix(plugin-form-builder): fix bug with optional chain operator in field overrides logic (#6602)

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

packages/plugin-form-builder/src/collections/FormSubmissions/index.ts

@@ -95,7 +95,7 @@ export const generateSubmissionCollection = (
     fields:
       formConfig?.formSubmissionOverrides?.fields &&
       typeof formConfig?.formSubmissionOverrides?.fields === 'function'
-        ? formConfig?.formSubmissionOverrides?.fields({ defaultFields })
+        ? formConfig.formSubmissionOverrides.fields({ defaultFields })
         : defaultFields,
     hooks: {
       ...(formConfig?.formSubmissionOverrides?.hooks || {}),

packages/plugin-form-builder/src/collections/Forms/index.ts

@@ -230,8 +230,8 @@ export const generateFormCollection = (formConfig: FormBuilderPluginConfig): Col
       ...(formConfig?.formOverrides?.admin || {}),
     },
     fields:
-      formConfig?.formOverrides.fields && typeof formConfig?.formOverrides.fields === 'function'
-        ? formConfig?.formOverrides.fields({ defaultFields })
+      formConfig?.formOverrides?.fields && typeof formConfig?.formOverrides?.fields === 'function'
+        ? formConfig.formOverrides.fields({ defaultFields })
         : defaultFields,
   }