Ignore seed prototype on the client.

Content.Client/EntryPoint.cs

@@ -75,6 +75,7 @@ namespace Content.Client
             prototypes.RegisterIgnore("material");
             prototypes.RegisterIgnore("reaction"); //Chemical reactions only needed by server. Reactions checks are server-side.
             prototypes.RegisterIgnore("gasReaction");
+            prototypes.RegisterIgnore("seed"); // Seeds prototypes are server-only.
             prototypes.RegisterIgnore("barSign");
 
             ClientContentIoC.Register();