Corrected wrong annotation

[mwetter]

This closes #1842

[jelgerjansen]

Hi Michael

Three minor remarks regarding the icon graphics:

1. I noticed you now use a dark blue rectangle in the icon, while MediumColumn has a light blue background (that partly changes to red, depending on the choice of densitySelection. Maybe we can change line 120 into fillColor={85,170,255}? Or did you pick another color on purpose?
2. The texstring "Top" has a larger font than "Bottom" because the font size is not specifically set. This is also the case for Airflow.Multizone.MediumColumn. Explicitly setting the fontsize to 36 gives both strings a font size that corresponds to the current font size of Bottom.
3. The textstring "name" is not centered in the middle. Again, this is also the case for Airflow.Multizone.MediumColumn.

These are very small (and fussy) comments, so feel free to ignore them ;)

[mwetter]

@jelgerjansen : Thanks for the feedback. I addressed them in 995bedb

Can you please review and approve if all is fine so it will merged.

[jelgerjansen]

@mwetter while looking over the changes I noticed another minor icon inaccuracy in MediumColumn, which I fixed in 5ffc308. All other changes look fine by me