Fix wrong type of TRANSACTION_ID in journal metadata

In the log API, it prints message to systemd journal and
also stores TRANSACTION_ID metadata with its value as %lld.
However, the transaction id is acquired from sdbusplus::server::
transaction::get_id(), which is a uint64_t.
The type of TRANSACTION_ID metadata should be changed to %llu,
otherwise phosphor::logging::internal::Manager::_commit() may not
find the matched journal entry.

Signed-off-by: Stanley Chu <yschu@nuvoton.com>
Change-Id: I2a70ae836ae33006a043569d2e3a692fcece7303
diff --git a/lib/include/phosphor-logging/log.hpp b/lib/include/phosphor-logging/log.hpp
index 14c0faa..4c826ac 100644
--- a/lib/include/phosphor-logging/log.hpp
+++ b/lib/include/phosphor-logging/log.hpp
@@ -163,7 +163,7 @@
     constexpr const char* msg_str = "MESSAGE=%s";
     const auto msg_tuple = std::make_tuple(msg_str, std::forward<Msg>(msg));
 
-    constexpr auto transactionStr = "TRANSACTION_ID=%lld";
+    constexpr auto transactionStr = "TRANSACTION_ID=%llu";
     auto transactionId = sdbusplus::server::transaction::get_id();
 
     auto log_tuple = std::tuple_cat(details::prio<L>(), msg_tuple,