Fix calls always started in grid view
Fix calls always started in grid view

The BrowserStorage returns a string, but isGrid is expected to be a
boolean, so both "true" and "false" were truthy values.

Signed-off-by: Daniel Calviño Sánchez <bd7629e975cc0e00ea7cda4ab6a120f2ee42ac1b@gmail.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed