descriptives fix labelling / arrangement for split plot (#3682)
descriptives fix labelling / arrangement for split plot (#3682)

fixes [#593](https://github.com/jasp-stats/INTERNAL-jasp/issues/593)
TimKDJ/jasp-desktop,boutinb/jasp-desktop,TimKDJ/jasp-desktop,boutinb/jasp-desktop,TimKDJ/jasp-desktop,vankesteren/jasp-desktop,jasp-stats/jasp-desktop,vankesteren/jasp-desktop,TimKDJ/jasp-desktop,FransMeerhoff/jasp-desktop,AlexanderLyNL/jasp-desktop,vankesteren/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,FransMeerhoff/jasp-desktop,FransMeerhoff/jasp-desktop,jasp-stats/jasp-desktop,vankesteren/jasp-desktop,boutinb/jasp-desktop,vankesteren/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,vankesteren/jasp-desktop,jasp-stats/jasp-desktop,vankesteren/jasp-desktop,FransMeerhoff/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,TimKDJ/jasp-desktop,AlexanderLyNL/jasp-desktop,TimKDJ/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,FransMeerhoff/jasp-desktop,FransMeerhoff/jasp-desktop,TimKDJ/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,TimKDJ/jasp-desktop,boutinb/jasp-desktop,FransMeerhoff/jasp-desktop,FransMeerhoff/jasp-desktop,boutinb/jasp-desktop,vankesteren/jasp-desktop