[test][docker_execution] Redo database root_folder setup after prefix cleanup

The prefix is resynced after the CXX tests, therefore
ensure that the original root_folder setup is applied
again.

This avoids breaking tests when CXX tests run before
the raw access tests.
4 jobs for 105_refactor_database_sharing in 17 minutes and 42 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #218167
docker-build
build_linux_36

00:14:55

64.0%
passed #218168
docker-build
build_linux_37

00:14:53

64.0%
passed #218165
macosx
build_macosx_36

00:17:42

64.0%
passed #218166
macosx
build_macosx_37

00:17:23

64.0%