[FlashpointInstaller] Make Extras category to unchecked by default

Author: WumboSpasm

FlashpointInstaller/src/Common.cs

@@ -233,7 +233,7 @@ public static TreeNode AddNodeToList(XmlNode child, TreeNodeCollection parent)
 
                 // Initialize checkbox
                 // (the Checked attribute needs to be explicitly set or else the checkbox won't appear)
-                listNode.Checked = child.Name == "component";
+                listNode.Checked = child.Name == "component" && !listNode.Name.StartsWith("extra");
 
                 return listNode;
             }