GLRenderer: update viewport even if FBO ID already set

The inherited viewport state could be outdated or incorrect, this makes sure it matches exactly

jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java

@@ -1563,13 +1563,13 @@ public class GLRenderer implements Renderer {
                 updateFrameBuffer(fb);
             }
 
+            // update viewport to reflect framebuffer's resolution
+            setViewPort(0, 0, fb.getWidth(), fb.getHeight());
+            
             if (context.boundFBO != fb.getId()) {
                 glfbo.glBindFramebufferEXT(GLExt.GL_FRAMEBUFFER_EXT, fb.getId());
                 statistics.onFrameBufferUse(fb, true);
 
-                // update viewport to reflect framebuffer's resolution
-                setViewPort(0, 0, fb.getWidth(), fb.getHeight());
-
                 context.boundFBO = fb.getId();
             } else {
                 statistics.onFrameBufferUse(fb, false);