TDS: Missing break in switch (CID 280475 & 281377)

Change-Id: I9416e07f497081f7117e8c3ccb741ea601de9cdd
Reviewed-on: https://code.wireshark.org/review/5993
Reviewed-by: Michael Mann <mmann78@netscape.net>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>