Set readonly value during initialisation of raw editor

[licitdev]

Description

Fixes #16162. Sets the readOnly option during initialisation of CodeMirror.

A similar configuration is already in place for input-code.

directus/app/src/interfaces/input-code/input-code.vue

Lines 257 to 264 in 8fcca49

	const cmOptions = computed<Record<string, any>>(() => {
	return Object.assign(
	{},
	defaultOptions,
	{
	lineNumbers: props.lineNumber,
	lineWrapping: props.lineWrapping,
	readOnly: readOnly.value,

Type of Change

• Bugfix
• Improvement
• New Feature
• Refactor / codestyle updates
• Other, please describe:

Requirements Checklist

• New / updated tests are included
• All tests are passing locally
• Performed a self-review of the submitted code

If adding a new feature:

• Documentation was added/updated. PR:

[azrikahar]

LGTM!