Bugfix worng colors on unflag

src/main/java/Minesweeper/Cell.java

@@ -18,7 +18,7 @@ public class Cell extends JButton {
 
 	private static final Color FLAGCOLOR = Color.RED;
 	private static final Color FLOODEDCOLOR = Color.LIGHT_GRAY;
-	private static final Color HIDDENCOLOR = Color.GRAY;
+	private static final Color HIDDENCOLOR = Color.WHITE;
 	private static final Color MINECOLOR = Color.BLACK;
 	private static final long serialVersionUID = 1L;
 	private Playfield playfield;
@@ -33,7 +33,7 @@ public class Cell extends JButton {
 		cord = _cord;
 		playfield = _playfield;
 		
-		setBackground(Color.white);
+		setBackground(HIDDENCOLOR);
 		addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
@@ -72,11 +72,9 @@ public class Cell extends JButton {
 			if (flagged) {
 				flagged = false;
 				
+				setBackground(HIDDENCOLOR);
 				if (type == CellType.Number) {
-					setBackground(HIDDENCOLOR);
 					playfield.cellDried();
-				} else {
-					setBackground(MINECOLOR);
 				}
 				
 			} else {