TBR syncbase mojo: fix to use WithNewTrace ctx

Change-Id: I21508cf76f6bac49c173ff38368b4bce4993917e
diff --git a/x/ref/services/syncbase/server/mojo_impl.go b/x/ref/services/syncbase/server/mojo_impl.go
index 8787d0f..fe515f1 100644
--- a/x/ref/services/syncbase/server/mojo_impl.go
+++ b/x/ref/services/syncbase/server/mojo_impl.go
@@ -50,7 +50,7 @@
 
 func (m *mojoImpl) newCtxCall(suffix string, method rpc.MethodDesc) (*context.T, rpc.ServerCall) {
 	ctx, _ := vtrace.WithNewTrace(m.ctx)
-	return ctx, newMojoServerCall(m.ctx, m.srv, suffix, method)
+	return ctx, newMojoServerCall(ctx, m.srv, suffix, method)
 }
 
 ////////////////////////////////////////