Fixes element id name.

index.html

                     <span data-i18n="poweredby"></span> jitsi.org
                 </a>
                 <div id="dominantSpeaker">
-                    <img id="domianatSpeakerAvatar" src=""/>
+                    <img id="dominantSpeakerAvatar" src=""/>
                     <canvas id="dominantSpeakerAudioLevel"></canvas>
                 </div>
                 <div id="largeVideoWrapper">