[QT] use alert icon with tooltip insted of "(out of sync)" text

# Conflicts:
#	src/qt/forms/overviewpage.ui
#	src/qt/overviewpage.cpp

src/qt/overviewpage.cpp

@@ -129,10 +129,6 @@ OverviewPage::OverviewPage(QWidget *parent) :
 
     connect(ui->listTransactions, SIGNAL(clicked(QModelIndex)), this, SLOT(handleTransactionClicked(QModelIndex)));
 
-    // init "out of sync" warning labels
-    ui->labelWalletStatus->setText("(" + tr("out of sync") + ")");
-    ui->labelTransactionsStatus->setText("(" + tr("out of sync") + ")");
-
     // start with displaying the "out of sync" warnings
     showOutOfSyncWarning(true);
 }