[qtmozembed] Don't resume backgrounded web view

The patch fixes the bug when html5 video gets resumed even if the corresponding webview is background:

"1) Opened Browser and a YouTube tab
2) Started to play the video, after a while opened a new tab (Google search), and the YouTube video stopped playing ( which is expected)
3) Swiped the Browser app and it was backgrounded. 
4) Opened the Messages application and replied to a message 
5) Right after I closed the Messages application, the YouTube music started to play again
6) I tapped on Browser cover, opened it and checked that still Google search tab is the active tab in Browser"
Actually this line (and my change of the line too) seems to be useless. Everything works with this constructor code removed.