fix(build) increase external_api bundle size

We are off my 1KB oh well.

webpack.config.js

             library: 'JitsiMeetExternalAPI',
             libraryTarget: 'umd'
         }),
-        performance: getPerformanceHints(30 * 1024)
+        performance: getPerformanceHints(35 * 1024)
     })
 ];