TBR: travel: syncbase: update apps to use new SyncGroupSpec API

MultiPart: 6/6
Change-Id: I9af729c1eba742119f1934770c018a0fc8c56b4e
diff --git a/src/vanadium-wrapper/syncbase-wrapper.js b/src/vanadium-wrapper/syncbase-wrapper.js
index a56464b..9072b1a 100644
--- a/src/vanadium-wrapper/syncbase-wrapper.js
+++ b/src/vanadium-wrapper/syncbase-wrapper.js
@@ -329,7 +329,12 @@
               ['Resolve', {in: initialPermissions}],
               ['Debug', {in: [admin]}]
             ]),
-            prefixes: prefixes.map(function(p) { return 't:' + joinKey(p); }),
+            prefixes: prefixes.map(function(p) {
+              return new syncbase.nosql.SyncGroupPrefix({
+                tableName: 't',
+                rowPrefix: joinKey(p)
+              });
+            }),
             mountTables: mountTables
           });
         },