Fixed Some issue on Describe>Graphs>Histogram and Boxplot Dialog

[MeSophie]

Fixes #8659
@rdstern I Fixed the oddity issue on Histogram and Boxplot Dialogs . Please have a look.

[rdstern]

@MeSophie on the ridge plots for say climatic data, (like dodoma, the fill now seems to work fine, but colour still doesn't?
The boxplot options work well now.

[MeSophie]

@rdstern please can you check again?

[rdstern]

It still didn't like me just adding colour?

[MeSophie]

It still didn't like me just adding colour?

@rdstern since you didn't fill the colour control in the aesthetics you will not have the colour on the graph. Because on the main dialog when we use Density/ridges button, the two receivers are for x and y parameters. If you want color without going to sub dialog then I cant add a receiver for colour.

[rdstern]

@MeSophie I was happy to go to the sub-dialog. Now - after your change (many thanks), I can add fill on the sub-dialog. Oh, now I can add colour! I'll approve.
@N-thony can you check the code and then merge if all is ok.