tlv: Use the encoding/decoding functions for "double" from ndn-cxx

refs: #4615

Change-Id: I0bde7085876646f272ee6006f4d3cfbd513d4ffd
diff --git a/src/conf-parameter.cpp b/src/conf-parameter.cpp
index 8a2cb5a..67a5b4b 100644
--- a/src/conf-parameter.cpp
+++ b/src/conf-parameter.cpp
@@ -29,7 +29,7 @@
 INIT_LOGGER(ConfParameter);
 
 // To be changed when breaking changes are made to sync
-const uint64_t ConfParameter::SYNC_VERSION = 6;
+const uint64_t ConfParameter::SYNC_VERSION = 7;
 
 static std::unique_ptr<ndn::security::v2::CertificateFetcherDirectFetch>
 makeCertificateFetcher(ndn::Face& face)