src: Replace class "errorbox" per T300306

wikimedia / mediawiki-gadgets-RTRC

Mirror of https://gerrit.wikimedia.org/g/mediawiki/gadgets/RTRC.

https://meta.wikimedia.org/wiki/RTRC

MIT License

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Closed libkoi closed 2 years ago

libkoi commented 2 years ago

class "errorbox" will be deleted in the future, so replace them with "mw-message-box mw-message-box-error".