Update PSurfaceAWT.java

Forgot the import statements

Author: Stefterv

core/src/processing/awt/PSurfaceAWT.java

@@ -33,8 +33,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-import javax.swing.JFrame;
-import javax.swing.SwingUtilities;
+import javax.swing.*;
 
 import processing.core.PApplet;
 import processing.core.PConstants;