Revert "add researchers yaml group to stat1003"

This doesn't work to a wikidev
group dependency on stat1003 which causes
a duplicate definition.

Looks like we can't switch just one user at
a time. So somebody please provide the list of
researchers.

This reverts commit fa7755b9ac986e7b0c4459ee804419664d811cb4.

Change-Id: I973c2fca6c73c766ec45e341275d10e174a9ca5c