Embeddings do not get re-computed automatically

[SebieF]

Currently, if a user already ran biotrainer and thus there already exist pre-computed embeddings, these embeddings do not get re-computed if the sequences.fasta file has changed. This might be a problem if users add new sequences or modify existing ones after their first run. This should not be a problem that occurs regularly, and fixing it will likely require some shifts in the pipeline. It should, however, be kept in mind for future improvements.