QImageIOHandler: remove #if around virtual method name()

It makes -DQT_DISABLE_DEPRECATED_BEFORE=0x050d00 (in an application)
trigger a binary incompatible change and crash.

Change-Id: I9b9783d134821697180dc3fd8f2f69a51ddb7ac6
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/gui/image/qimageiohandler.cpp

@@ -416,18 +416,16 @@ QByteArray QImageIOHandler::format() const
     \sa read(), QIODevice::peek()
 */
 
-#if QT_DEPRECATED_SINCE(5, 13)
 /*!
     \obsolete
 
     Use format() instead.
 */
 
-QByteArray QImageIOHandler::name() const
+QByteArray QImageIOHandler::name() const // ### Qt6: remove
 {
     return format();
 }
-#endif
 
 /*!
     Writes the image \a image to the assigned device. Returns \c true on

src/gui/image/qimageiohandler.h

@@ -69,10 +69,8 @@ public:
     void setFormat(const QByteArray &format) const;
     QByteArray format() const;
 
-#if QT_DEPRECATED_SINCE(5, 13)
     QT_DEPRECATED_X("Use QImageIOHandler::format() instead")
     virtual QByteArray name() const;
-#endif
 
     virtual bool canRead() const = 0;
     virtual bool read(QImage *image) = 0;