test/integration/update: Speed up test
test/integration/update: Speed up test

  Integration tests try to match real situations as close as possible so
  we usually run a lot of full sync loops in tests and setups. However,
  these are very costly and make tests really slow so we should avoid
  them when possible.

  One of our « updates » integration tests setup was quite slow and we
  found that at least one full sync was unnecessary as removing it would
  not really change the steps taken by the Desktop clients so we simply
  removed it.

cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop