changed frame.setResizable() to surface.setResizable()

gse.pde

@@ -28,7 +28,7 @@ void setup() {
   frameRate(24);
   size(960, 540);
   //fullScreen;
-  frame.setResizable(true);
+  surface.setResizable(true);
   smooth();
   drop = new SDrop(this);
   backgroundImage = loadImage("assets/background.jpg");