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/walletframe.cpp

@@ -88,9 +88,9 @@ void WalletFrame::gotoReceiveCoinsPage()
     walletStack->gotoReceiveCoinsPage();
 }
 
-void WalletFrame::gotoSendCoinsPage()
+void WalletFrame::gotoSendCoinsPage(QString addr)
 {
-    walletStack->gotoSendCoinsPage();
+    walletStack->gotoSendCoinsPage(addr);
 }
 
 void WalletFrame::gotoSignMessageTab(QString addr)