Use full file path in the MztabWriter run map instead of just the file name.

[Lilferrit]

The current implementation of MztabWriter on the dev_latest_depthcharge branch only uses the file name to index peak files instead of the full path. This will lead to incorrect behavior when sequencing spectra from two peak files that have different paths but have the same filename, e.g. foo/spectra.mgf and bar/spectra.mgf. This should be implemented after the depthcharge spectrum datasets are updated to include the full file path for each spectrum. This can be implemented by simply changing the following line in MztabWriter.set_ms_run:

self._run_map[Path(filename).name] = i

[Lilferrit]

Related to wfondrie/depthcharge#65