[minor] Market standard version number not retrieved correctly from dockerhub

[pbartusch]

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SMUI only retrieved the major and minor version number of the dockerhub market standard correctly. The patch number stays 0. Probably, this is happened when changing the tagging policy of containers on dockerhub (having individual tags for major, minor and patch number).

smui/app/models/config/SmuiVersion.scala :: latestVersionFromDockerHub() needs to be fixed.