Update macaroon lib

Change-Id: I37472f11827b8bf1af28c6f525df85093f5f3a56
Reviewed-on: https://weave-review.googlesource.com/2381
Reviewed-by: Alex Vakulenko <avakulenko@google.com>

third_party/libuweave/src/macaroon.c

diff --git a/third_party/libuweave/src/macaroon.c b/third_party/libuweave/src/macaroon.c
index 50b2d00..aa775c2 100644
--- a/third_party/libuweave/src/macaroon.c
+++ b/third_party/libuweave/src/macaroon.c
@@ -146,7 +146,7 @@
   for (size_t i = 0; i < MAX_NUM_DELEGATEES; i++) {
     result->delegatees[i].id = NULL;
     result->delegatees[i].id_len = 0;
-    result->delegatees[i].is_app = true;
+    result->delegatees[i].type = kUwMacaroonDelegateeTypeNone;
   }
 }