Lower MultiPV max to MAX_MOVES

Link max value of MultiPV to that of MAX_MOVES which is 256

closes #4951

No functional change

src/ucioption.cpp

@@ -70,7 +70,7 @@ void init(OptionsMap& o) {
     o["Hash"] << Option(16, 1, MaxHashMB, on_hash_size);
     o["Clear Hash"] << Option(on_clear_hash);
     o["Ponder"] << Option(false);
-    o["MultiPV"] << Option(1, 1, 500);
+    o["MultiPV"] << Option(1, 1, MAX_MOVES);
     o["Skill Level"] << Option(20, 0, 20);
     o["Move Overhead"] << Option(10, 0, 5000);
     o["nodestime"] << Option(0, 0, 10000);