Add detector type icons in editor tabs

[Mailaender]

to get some vertical space back since the column type is also suffixed now:

and regain some consistency with the 3.X editor from projects that does not add these suffixes.

[eselmeister]

Adding distinct icons for different detector types is a good idea. But to display the detector type [CSD], [MSD], [VSD], [WSD] helps to keep the overview if a chromatogram with the same name but different detectors is open in the editor tab. Hence, I would like to keep it.