QT4: Force need_update on creation so we could view everything on first open...

QT4: Force need_update on creation so we could view everything on first open of Media Information window
Patch by Hannes Domani, ssbssa -AT- yahoo -boring dot- de

modules/gui/qt4/dialogs/mediainfo.cpp

@@ -45,6 +45,7 @@ MediaInfoDialog::MediaInfoDialog( intf_thread_t *_p_intf, bool _mainInput,
 {
     i_runs = 0;
     p_input = NULL;
+    need_update = true;
 
     setWindowTitle( qtr( "Media information" ) );
     resize( 700 , 450 );