Input Provider with Storybook knobs not working

[sareh]

Describe the bug
The input provider drop-down is broken on latest

To Reproduce
Steps to reproduce the behaviour:

1. Go to
   https://bbc.github.io/psammead/?path=/story/components-headline--default
   https://bbc.github.io/psammead/?path=/story/components-inlinelink--default
2. On the 'knobs' panel, select a service that is not 'news'. e.g arabic.
3. See just right-aligned english copy.

This is the case for all stories that use knobs and the inputProvider in psammead-storybook-helpers

Expected behaviour
When you select a service that is not news, you should get copy written in the relevant language.

Screenshots
Pasted above.

Additional context
Way to see it working again: Pin to version 5.0.6.
However, it should be fixed forwards instead of pinned to this older version.

[ghost]

This seem to be caused by storybook knobs not being updated. It can be reproduced without inputProvider

.add('the bug', () => {
    const contents = { news: 'this is news', arabic: 'this is arabic' };
    const options = ['news', 'arabic'];

    const selected = select('Select', options, 'news');
    const value = text('Contents', contents[selected]);

    return <span> {value} </span>;
  })

[ghost]

Option 1: Not to render value and render contents[selected] but then we loose the ability to edit the text.

[sareh]

@sadickisaac Since we rarely edit the text, I think it'd be a good option. It'd give us visibility of the text in the various languages and scripts, which we currently do not have.

[andrew-nowak]

:( Looks like this functionality got removed from storybook in the minor version increase to 5.1.0

This looks like the PR where it was removed https://github.com/storybookjs/storybook/pull/6486/files#diff-0f0ba9ed2031f812b0f6abbd2b80b14dL55

And this looks like the issue to follow for bringing the functionality back into storybook storybookjs/storybook#7150

I have found it useful in the past to be able to edit the text, but that functionality can be approximated in the browser dev console, so let's move forward with this until the functionality is readded to storybook