Guard inspector warning with PWA define

Author: jfreire-unity

Packages/com.unity.inputsystem/InputSystem/Plugins/PlayerInput/PlayerInputEditor.cs

@@ -81,18 +81,19 @@ public override void OnInspectorGUI()
             EditorGUILayout.PropertyField(m_ActionsProperty);
             var actionsWereChanged = false;
 
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+            // Check for if we're using project-wide actions to raise a warning message.
             if (m_ActionsProperty.objectReferenceValue != null)
             {
                 InputActionAsset actions = m_ActionsProperty.objectReferenceValue as InputActionAsset;
-                // Check for if we're using project-wide actions to raise warning
                 if (actions == InputSystem.actions)
                 {
                     EditorGUILayout.HelpBox("Project-wide actions asset is not recommended to be used with Player " +
                         "Input because it is a singleton reference and all actions maps are enabled by default.\r\n",
                         MessageType.Warning);
                 }
             }
-
+#endif
             if (EditorGUI.EndChangeCheck() || !m_ActionAssetInitialized || CheckIfActionAssetChanged())
             {
                 OnActionAssetChange();