fix "send coins" via context menu in address book

- the send coins context menu entry was not working anymore, because
  a non current version of #2220 was merged onto current master
- also removes some unneeded spaces and adds a comment to
  WalletModel::getNumTransactions()

src/qt/walletstack.cpp

@@ -97,11 +97,11 @@ void WalletStack::gotoReceiveCoinsPage()
         i.value()->gotoReceiveCoinsPage();
 }
 
-void WalletStack::gotoSendCoinsPage()
+void WalletStack::gotoSendCoinsPage(QString addr)
 {
     QMap<QString, WalletView*>::const_iterator i;
     for (i = mapWalletViews.constBegin(); i != mapWalletViews.constEnd(); ++i)
-        i.value()->gotoSendCoinsPage();
+        i.value()->gotoSendCoinsPage(addr);
 }
 
 void WalletStack::gotoSignMessageTab(QString addr)