add i09 and i21 to while list

[Relm-Arrowny]

#137
Added i09 and i21 lookuptables to while list.

[Relm-Arrowny]

@DiamondLightSource/smg just in case someone should just check those.

[Villtord]

Looks good, thanks!

There would be also I07 and I16 lookuptables, but I am not so sure which one they actually use.

In my last attempt to figure this out I found for I07:
/dls_sw/i07/software/gda/workspace_git/gda-diamond.git/configurations/i07-config/lookupTables/
and for I16:
/dls_sw/i16/var/

but maybe David knows better...

[DG-At-Diamond]

Those paths are both correct for my beamlines, i07's is called IIDCalibrationTable.txt and i16's is U27_GBH.dat. It might make sense to move the i07 one as it's currently in GDA. Neither follows the same format as other beamlines do, I've added a class to read the i07 one here DiamondLightSource/dodal#1696, haven't looked at the i16 one yet.