Editor: Fix Jumping Cursor

[Samk13]

:heart: Thank you for your contribution!

Description

• Closes https://github.com/inveniosoftware/invenio-app-rdm/issues/2730
• See https://www.tiny.cloud/docs/tinymce/6/react-ref/#initialvalue
• Add the missing onEditorChange and initialValue props.
• There was ambiguity between value and initialValue in the props consumption; this change also fixes that.
• I intentionally kept the prop value={inputValue} as value={value} seems to conflict with the requests package.

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[kpsherva]

LGTM! I have only one concern, did you manage to check if any other usage (other than the subsequent PR in invenio-request solves) is affected by this change?