b5bec4e330
Construct QTimer object directly, instead of relying on QTimer::singleShot
overloads accepting lambdas, which weren't introduced until Qt 5.4.
Avoids the following compile error in debian jessie:
```
qt/test/wallettests.cpp: In function ‘void {anonymous}::ConfirmSend()’:
qt/test/wallettests.cpp:34:6: error: no matching function for call to ‘QTimer::singleShot(int, Qt::TimerType, {anonymous}::ConfirmSend()::<lambda()>)’
});
^
qt/test/wallettests.cpp:34:6: note: candidates are:
In file included from /usr/include/x86_64-linux-gnu/qt5/QtCore/QTimer:1:0,
from ./qt/sendcoinsdialog.h:13,
from qt/test/wallettests.cpp:7:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qtimer.h:81:17: note: static void QTimer::singleShot(int, const QObject*, const char*)
static void singleShot(int msec, const QObject *receiver, const char *member);
^
/usr/include/x86_64-linux-gnu/qt5/QtCore/qtimer.h:81:17: note: no known conversion for argument 2 from ‘Qt::TimerType’ to ‘const QObject*’
/usr/include/x86_64-linux-gnu/qt5/QtCore/qtimer.h:82:17: note: static void QTimer::singleShot(int, Qt::TimerType, const QObject*, const char*)
static void singleShot(int msec, Qt::TimerType timerType, const QObject *receiver, const char *member);
^
/usr/include/x86_64-linux-gnu/qt5/QtCore/qtimer.h:82:17: note: candidate expects 4 arguments, 3 provided
```
Error reported by Pavel Janík <Pavel@Janik.cz> in
https://github.com/bitcoin/bitcoin/pull/9974#issuecomment-287574436