Use correct signature for Qt mouseEvent and keyEvent

src/qt/uiaction.cpp

@@ -31,9 +31,9 @@ using namespace QTest;
 
 // Apparently {mouse,key}Event() functions signature has changed from QWidget
 // to QWindow at some time during Qt5, but we don't know when exactly. We do
-// know that they take QWindow for 5.3 and, presumably, later versions (but not
+// know that they take QWindow for 5.2 and, presumably, later versions (but not
 // for whichever version this code was originally written for).
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 3, 0))
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
 inline QWindow* argForEvents(QWidget* w) { return w->windowHandle(); }
 #else
 inline QWidget* argForEvents(QWidget* w) { return w; }