Error on revision pages [#3387229]

Problem/Motivation

Got error 'PHP message: Error: Call to a member function getEntityTypeId() on string in /jails/site50019/var/www/public/drupal/modules/contrib/language_switcher_browser/src/EventSubscriber/LanguageRedirectionSubscriber.php on line 104 #0 [internal function]: Drupal\language_switcher_browser\EventSubscriber\LanguageRedirectionSubscriber->onRequest()

Steps to reproduce

Actually if you visit an node revision page. The routematch node parameter is a string. This causes the error.

Issue fork language_switcher_browser-3387229

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