feat: disable overlay by default

Author: remcowesterhoud

src/main/java/com/westerhoud/osrs/taskman/TaskmanConfig.java

@@ -31,6 +31,6 @@ default String passphrase() {
       name = "Show current task overlay",
       description = "Adds an overlay displaying the current task to the game client")
   default boolean showOverlay() {
-    return true;
+    return false;
   }
 }