Fix a typo in LwjglWindow (#1953)

jme3-lwjgl3/src/main/java/com/jme3/system/lwjgl/LwjglWindow.java

@@ -287,7 +287,7 @@ public abstract class LwjglWindow extends LwjglContext implements Runnable {
         final GLFWVidMode videoMode = glfwGetVideoMode(glfwGetPrimaryMonitor());
         int requestWidth = settings.getWindowWidth();
         int requestHeight = settings.getWindowHeight();
-        if (requestWidth <= 0 || requestWidth <= 0) {
+        if (requestWidth <= 0 || requestHeight <= 0) {
             requestWidth = videoMode.width();
             requestHeight = videoMode.height();
         }