Remove duplicated line in config.js (#2159)

config.js

     // Disable hiding of remote thumbnails when in a 1-on-1 conference call.
     // disable1On1Mode: false,
 
-
-    // The minumum value a video's height (or width, whichever is smaller) needs
     // The minimum value a video's height (or width, whichever is smaller) needs
     // to be in order to be considered high-definition.
     minHDHeight: 540,