SPIGOT-6206: Use correct sender UUID for chat messages

By: Mariell Hoversholm <proximyst@proximyst.com>

paper-server/nms-patches/EntityPlayer.patch

@@ -715,9 +715,9 @@
      }
  
 +    // CraftBukkit start - Support multi-line messages
-+    public void sendMessage(IChatBaseComponent[] ichatbasecomponent) {
++    public void sendMessage(UUID uuid, IChatBaseComponent[] ichatbasecomponent) {
 +        for (IChatBaseComponent component : ichatbasecomponent) {
-+            this.sendMessage(component, SystemUtils.b);
++            this.sendMessage(component, (uuid == null) ? SystemUtils.b : uuid);
 +        }
 +    }
 +    // CraftBukkit end