fixed set pdc command to utilize @s selector for gui runs

src/main/java/CoswayUtil/CoswayUtil.java

@@ -253,7 +253,7 @@ public final class CoswayUtil extends JavaPlugin implements Listener {
                 return false;
             } else {
                 Player target = null;
-                if(args[0] == "@s") {
+                if(args[0].equals("@s")) {
                      target = player;
                 } else {
                     target = getServer().getPlayer(args[0]);