Fix overrides not being read from the server registry snapshot (#4224)

src/main/java/net/minecraftforge/fml/common/network/handshake/FMLHandshakeClientState.java

@@ -130,6 +130,7 @@ enum FMLHandshakeClientState implements IHandshakeState<FMLHandshakeClientState>
             ForgeRegistry.Snapshot entry = new ForgeRegistry.Snapshot();
             entry.ids.putAll(pkt.getIdMap());
             entry.dummied.addAll(pkt.getDummied());
+            entry.overrides.putAll(pkt.getOverrides());
             snap.put(pkt.getName(), entry);
 
             if (pkt.hasMore())

src/main/java/net/minecraftforge/fml/common/network/handshake/FMLHandshakeMessage.java

@@ -261,6 +261,11 @@ public abstract class FMLHandshakeMessage {
             return dummied;
         }
 
+        public Map<ResourceLocation, String> getOverrides()
+        {
+            return overrides;
+        }
+
         public ResourceLocation getName()
         {
             return this.name;