TDS: Make buildbot happy

Fix Field 'Server Version' (tds.server_version) is an integral value (FT_UINT32) but is being displayed as BASE_NONE

Change-Id: I601e71ac8e7928ef90fdd16956af3a34bca269a9
Reviewed-on: https://code.wireshark.org/review/4836
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>