wspr: Share the type stream for server messages.

MultiPart: 2/2
Change-Id: I971fe9521b30c4e42cb826da6e53ed2890154fd1
diff --git a/services/wspr/internal/app/app.go b/services/wspr/internal/app/app.go
index f26d773..2c89518 100644
--- a/services/wspr/internal/app/app.go
+++ b/services/wspr/internal/app/app.go
@@ -981,3 +981,7 @@
 func (c *Controller) TypeEncoder() *vom.TypeEncoder {
 	return c.typeEncoder
 }
+
+func (c *Controller) TypeDecoder() *vom.TypeDecoder {
+	return c.typeDecoder
+}