Path name patterns are not resolved when metafile name does not contain a "*"

[mario-winkler]

Extracting metadata from a Sentinel 2 MSI L1/L2 scene folder (not zipped) using the S2_MSI.xml or S2_MSI.eop.csv mappings fails because the path patterns in the metafile name are not resolved. The metafile is referenced in the mappings as MTD_MSIL[12][ABC].xml but extract.py only resolves path patterns if the file name contains a * (see line 130 and below).