fix(player): reduce flickers

Author: mas-iota

widget/templates/layouts/now-playing.html

@@ -77,7 +77,7 @@ <h4 class="margin-zero ellipsis whiteTheme">{{NowPlaying.currentTrack.title}}</h
                 <span class="glyphicon glyphicon-cog whiteTheme" ng-click="NowPlaying.getSettings()" role="button" tabindex="0" aria-label="Audio player settings"></span>
             </div>
             <div class="media-player-btns">
-                <span ng-style="{'visibility': ((NowPlaying.currentTrack.isAudioFromPluginList && !shuffleAudioListItems) || (!NowPlaying.currentTrack.isAudioFromPluginList && globalPlaylist)) ? 'hidden' : 'visible'}"  class="icon" ng-click="NowPlaying.shufflePlaylist()" role="button" tabindex="0" aria-label="Shuffle items"
+                <span ng-style="{'visibility': ((NowPlaying.currentTrack.isAudioFromPluginList && !shuffleAudioListItems) || (!NowPlaying.currentTrack.isAudioFromPluginList && globalPlaylist)) ? 'hidden' : 'visible'}"  class="icon visibility-hidden" ng-click="NowPlaying.shufflePlaylist()" role="button" tabindex="0" aria-label="Shuffle items"
                     aria-hidden="{{ ((NowPlaying.currentTrack.isAudioFromPluginList && !shuffleAudioListItems) || (!NowPlaying.currentTrack.isAudioFromPluginList && globalPlaylist)) ? true : false}}">
                     <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none">
                         <g opacity="0.9" clip-path="url(#clip0_1431_2874)">