Add option to listen by default

src/invidious/views/preferences.ecr

@@ -23,6 +23,11 @@ function update_value(element) {
                 <input name="autoplay" id="autoplay" type="checkbox" <% if user.preferences.autoplay %>checked<% end %>>
             </div>
 
+            <div class="pure-control-group">
+                <label for="listen">Listen by default: </label>
+                <input name="listen" id="listen" type="checkbox" <% if user.preferences.listen %>checked<% end %>>
+            </div>
+
             <div class="pure-control-group">
                 <label for="speed">Default speed: </label>
                 <select name="speed" id="speed">

src/invidious/views/watch.ecr

@@ -35,7 +35,7 @@
 <h1>
     <%= HTML.escape(video.title) %> 
     <% if params[:listen] %>
-    <a href="/watch?<%= env.params.query %>">
+    <a href="/watch?<%= env.params.query %>&listen=0">
         <i class="icon ion-ios-videocam"></i>
     </a>
     <% else %>