Editor: Update RichInputField to use inputValue instead of value

[Samk13]

❤️ Thank you for your contribution!

Description

• Added missing initialValue prop for RichInputField
• Update prop value to inputValue
• This will fix the input text issue in deposit pages, and communities settings pages
• Request comments work as expected.

Communities Invite members still need to be fixed

Closes inveniosoftware/invenio-app-rdm#2771

I'm currently on vacation, from a quick test when I changed inputValue to a function in the RichEditor instead of the RichInputField, it caused request comments to not clear the input after submission. This PR satisfies all editors except the "community members invite" editor, for which I can submit a similar fix if we agree.

Note : By providing the input value as a function instead of a string, it will fix the render issue. However, this will result in the console error: "Invalid prop value of type function supplied to Editor, expected string."

Feel free to implement a better solution if found.

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[max-moser]

Tested it out locally, this seems to fix the issue – thanks a ton!