[BUG] bowtie database not found

Describe the bug

I'm getting

No MetaPhlAn BowTie2 database found (--index option)!
Expecting location bowtie2db

when calling metaphlan as follows:

metaphlan ... --bowtie2db '/gpfs1/data/galaxy_server/galaxy/tool-data/metaphlan/data/mpa_v30_CHOCOPhlAn_201901/' --index 'mpa_v30_CHOCOPhlAn_201901' ...

The folder content is tree /gpfs1/data/galaxy_server/galaxy/tool-data/metaphlan/data/mpa_v30_CHOCOPhlAn_201901/

/gpfs1/data/galaxy_server/galaxy/tool-data/metaphlan/data/mpa_v30_CHOCOPhlAn_201901/
├── mpa_v30_CHOCOPhlAn_201901.1.bt2
├── mpa_v30_CHOCOPhlAn_201901.2.bt2
├── mpa_v30_CHOCOPhlAn_201901.3.bt2
├── mpa_v30_CHOCOPhlAn_201901.4.bt2
├── mpa_v30_CHOCOPhlAn_201901.fna.bz2
├── mpa_v30_CHOCOPhlAn_201901.md5
├── mpa_v30_CHOCOPhlAn_201901.pkl
├── mpa_v30_CHOCOPhlAn_201901.rev.1.bt2
├── mpa_v30_CHOCOPhlAn_201901.rev.2.bt2
└── mpa_v30_CHOCOPhlAn_201901.tar

I guess this is because

MetaPhlAn/metaphlan/metaphlan.py

Line 367 in 6c50424

if glob(os.path.join(bowtie2_db, "{}*.{}".format(index, bt2_ext))):

only checks if mpa_v30_CHOCOPhlAn_201901.bt2 is available and irgnores the possibility of mpa_v30_CHOCOPhlAn_201901.1.bt2.

Or do the bowtie indices be constructed in a different way?

To Reproduce

See above

Screenshots
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Platform (please complete the following information):

This is for the latest Galaxy tool version

Additional context
NA

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