chore: remove OC.fileIsBlacklisted

Its deprecated since Nextcloud 18 and nowadays we have much more complex
logic for this.
So the proper replacement is to use `validateFilename` from
`@nextcloud/files` package.

Signed-off-by: Ferdinand Thiessen <[email protected]>

Author: susnux

core/src/OC/index.js

@@ -105,14 +105,6 @@ export default {
 	/*
 	 * Deprecated helpers to be removed
 	 */
-	/**
-	 * Check if a user file is allowed to be handled.
-	 *
-	 * @param {string} file to check
-	 * @return {boolean}
-	 * @deprecated 17.0.0
-	 */
-	fileIsBlacklisted: (file) => !!(file.match(Config.blacklist_files_regex)),
 	Apps,
 	AppConfig,
 	appConfig,