Fix examples on decorator vignette

[llrs-roche]

Pull Request

Fixes comments on vignette example on #1357

[llrs-roche]

Thank Marcin, but this doesn't fix all examples, specially the interactive-from lang issue as shown on the video from #1357 (comment) is not fixed. At least on my computer.

My current understanding is that at https://github.com/insightsengineering/teal/blob/1187_decorate_output%40main/R/module_transform_data.R#L96 the teal_data has already the new x_axis_title (on third or fourth pass), but how it got there and how to trigger it again when I change the input still eludes me.

[llrs-roche]

Digging a b it deeper, I think that make_teal_transform_server() should have some kind of observe or binding to the input to ensure that when the input is updated the decorator is executed again. Otherwise it seems that it is only executed once