Improve regex to actually match IMDB ids (#196)

Community/Tdarr_Plugin_henk_Keep_Native_Lang_Plus_Eng.js

@@ -10,7 +10,7 @@ const details = () => ({
      (requires TMDB api key) and English.
     'Native' languages are the ones that are listed on imdb. It does an API call to 
     Radarr, Sonarr to check if the movie/series exists and grabs the IMDB id. As a last resort it 
-    falls back to '[imdb-ttDIGITS] in the filename.`,
+    falls back to the IMDB id in the filename.`,
   Version: '1.00',
   Link: 'https://github.com/HaveAGitGat/Tdarr_Plugins/blob/master/Community/'
     + 'Tdarr_Plugin_henk_Keep_Native_Lang_Plus_Eng.js',
@@ -139,7 +139,7 @@ const tmdbApi = async (filename, api_key, axios) => {
     if (filename.substr(0, 2) === 'tt') {
       fileName = filename;
     } else {
-      const idRegex = /\[imdb-(tt\d*)]/;
+      const idRegex = /tt\d*/;
       const fileMatch = filename.match(idRegex);
       // eslint-disable-next-line prefer-destructuring
       if (fileMatch) fileName = fileMatch[1];