Actually save the sequence number (#179)

Author: Greg Soltis

firebase-firestore/src/main/java/com/google/firebase/firestore/local/SQLiteQueryCache.java

@@ -81,21 +81,22 @@ private void saveQueryData(QueryData queryData) {
 
     Target targetProto = localSerializer.encodeQueryData(queryData);
 
-    // listen_sequence_number is zero until we actually implement offline GC
     db.execute(
         "INSERT OR REPLACE INTO targets ("
             + "target_id, "
             + "canonical_id, "
             + "snapshot_version_seconds, "
             + "snapshot_version_nanos, "
             + "resume_token, "
+            + "last_listen_sequence_number, "
             + "target_proto) "
-            + "VALUES (?, ?, ?, ?, ?, ?)",
+            + "VALUES (?, ?, ?, ?, ?, ?, ?)",
         targetId,
         canonicalId,
         version.getSeconds(),
         version.getNanoseconds(),
         queryData.getResumeToken().toByteArray(),
+        queryData.getSequenceNumber(),
         targetProto.toByteArray());
   }