Don't allow opening of shops via sign by default

This has caused lots of confusion in the past regarding the first time
setup and might be a feature that people don't even want to have.
(e.g. to allow coloring of the signs with dyes)

src/main/java/com/Acrobot/ChestShop/Configuration/Properties.java

@@ -150,7 +150,7 @@ public class Properties {
     public static String SHIFT_ALLOWS = "ALL";
 
     @ConfigurationComment("Can shop's chest be opened by owner with right-clicking a shop's sign?")
-    public static boolean ALLOW_SIGN_CHEST_OPEN = true;
+    public static boolean ALLOW_SIGN_CHEST_OPEN = false;
 
     @ConfigurationComment("If true, when you left-click your own shop sign you won't open chest's inventory, but instead you will start destroying the sign.")
     public static boolean ALLOW_LEFT_CLICK_DESTROYING = true;