make logging of guids less noisy

include/ua_log.h

@@ -121,7 +121,7 @@ UA_LOG_FATAL(UA_Logger logger, UA_LogCategory category, const char *msg, ...) {
 /**
  * Convenience macros for complex types
  * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
-#define UA_PRINTF_GUID_FORMAT "{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}"
+#define UA_PRINTF_GUID_FORMAT "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x"
 #define UA_PRINTF_GUID_DATA(GUID) (GUID).data1, (GUID).data2, (GUID).data3, \
         (GUID).data4[0], (GUID).data4[1], (GUID).data4[2], (GUID).data4[3], \
         (GUID).data4[4], (GUID).data4[5], (GUID).data4[6], (GUID).data4[7]