Fix autofocus on Channels tab

This limits the focus scope to the current tab, so that the
channel card is selected the first time you open it.

[for testing]
The Channels tab should be the default for the LiveTV library.

src/controllers/livetv/livetvchannels.js

@@ -120,7 +120,7 @@ export default function (view, params, tabContent) {
             isLoading = false;
 
             import('../../components/autoFocuser').then(({default: autoFocuser}) => {
-                autoFocuser.autoFocus(view);
+                autoFocuser.autoFocus(context);
             });
         });
     }