Fix tab complete using proper vanilla limit.

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteRequest.java

@@ -14,6 +14,8 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class TabCompleteRequest implements MinecraftPacket {
 
+  private static final int VANILLA_MAX_TAB_COMPLETE_LEN = 2048;
+
   private @Nullable String command;
   private int transactionId;
   private boolean assumeCommand;
@@ -78,9 +80,9 @@ public class TabCompleteRequest implements MinecraftPacket {
   public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion version) {
     if (version.compareTo(MINECRAFT_1_13) >= 0) {
       this.transactionId = ProtocolUtils.readVarInt(buf);
-      this.command = ProtocolUtils.readString(buf, Chat.MAX_SERVERBOUND_MESSAGE_LENGTH);
+      this.command = ProtocolUtils.readString(buf, VANILLA_MAX_TAB_COMPLETE_LEN);
     } else {
-      this.command = ProtocolUtils.readString(buf, Chat.MAX_SERVERBOUND_MESSAGE_LENGTH);
+      this.command = ProtocolUtils.readString(buf, VANILLA_MAX_TAB_COMPLETE_LEN);
       if (version.compareTo(MINECRAFT_1_9) >= 0) {
         this.assumeCommand = buf.readBoolean();
       }