Generate pileup from BAM dataset - tool output tabular format, not pileup

This has been very confusing for users. Could we modify the tool so that pileup is assigned?

BTW- when converting tabular to pileup, the UI consistantly produces a metadata error that requires "auto-detect" to correct. This is another hurdle for users. Tabular replaced pileup format assignment a while ago (tool used to output pileup results by default).

Possibly related to pileup format metadata/edit attributes issue here: https://github.com/galaxyproject/tools-devteam/issues/329