mixins: Don't clobber left click forced menuops

runelite-api/src/main/java/net/runelite/api/MenuEntry.java

@@ -59,5 +59,11 @@ public class MenuEntry
 	 * A second additional parameter for the action.
 	 */
 	private int param1;
-
+	/**
+	 * If this field is true and you have single mouse button on and this entry is
+	 * the top entry the right click menu will not be opened when you left click
+	 *
+	 * This is used  for shift click
+	 */
+	private boolean forceLeftClick;
 }