integration/ct: add missing popd
integration/ct: add missing popd

gtank/trillian,google/trillian,google/trillian,RJPercival/trillian,gdbelvin/trillian,RJPercival/trillian,Martin2112/trillian,AlCutter/trillian,daviddrysdale/trillian,gtank/trillian,gdbelvin/trillian,codingllama/trillian,Martin2112/trillian,AlCutter/trillian,daviddrysdale/trillian,Martin2112/trillian,gdbelvin/trillian,daviddrysdale/trillian,codingllama/trillian