Pbed composite dataset format has a weird prefix upon upload.

[elmedjadjirayane]

I noticed an issue when uploading a composite dataset as pbed format where the extra files have a prefix 'Composite Dataset' with the space included.

`

  <composite_data value="Composite Dataset.fam"/>
  </param>
  <output name="gemma_output" file="lm_output.tsv"/>
  <output name="gemma_output_int" file="lm_output.interval"/>
   
</test>

`