software/pureftpd: Updates software release to be python3 compliant

*  Updates component/pureftpd url to 1.0.49 version because the one provided do not exist anymore (the 1.0.46 version exists now under the path [https://download.pureftpd.org/pub/pure-ftpd/releases/obsolete/pure-ftpd-1.0.46.tar.bz2](https://download.pureftpd.org/pub/pure-ftpd/releases/obsolete/pure-ftpd-1.0.46.tar.bz2))
*  Deletes explicit slapos.toolbox dependency because it's automatically installed by monitor stack
4 jobs for erp5-component
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

22:52:30

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:55:12

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

02:46:27