ensure AskPassphraseDialog::eventFilter forwards events

- instead of "return false;" use "return QDialog::eventFilter(object,
  event);" to harmonize this event filter with our default behaviour
- remove orphan spaces found while editting the files

src/qt/askpassphrasedialog.h

@@ -39,7 +39,7 @@ private:
 private slots:
     void textChanged();
     bool event(QEvent *event);
-    bool eventFilter(QObject *, QEvent *event);
+    bool eventFilter(QObject *object, QEvent *event);
 };
 
 #endif // ASKPASSPHRASEDIALOG_H