Cycles: Fix the Convert Node type registration

The function that assigns names to socket types missed an entry, therefore all entries after it were mapped to the wrong name.
Long-term, it might be a better solution to use a map to avoid issues like these, but for now this fix works.

intern/cycles/graph/node_type.cpp

@@ -89,6 +89,7 @@ ustring SocketType::type_name(Type type)
 		ustring("boolean"),
 		ustring("float"),
 		ustring("int"),
+		ustring("uint"),
 		ustring("color"),
 		ustring("vector"),
 		ustring("point"),