[Qt] misc small fixes for #3099 (new receive flow)

- changes some strings that were forgotton or made no sense in the conext
  they are used
- remove an orphan file from the qt project file
- revert a small change in signverifymessagedialog.ui
- guard #include "bitcoin-config.h" with #if defined(HAVE_CONFIG_H)
- remove windowTitle from addressbookpage.ui

src/qt/receiverequestdialog.cpp

@@ -16,7 +16,9 @@
 #include <QUrl>
 #endif
 
+#if defined(HAVE_CONFIG_H)
 #include "bitcoin-config.h" /* for USE_QRCODE */
+#endif
 
 #ifdef USE_QRCODE
 #include <qrencode.h>