Remove a spurious static_cast<NumberOptions>

The value being so cast is already of that type, so just return it.

Change-Id: I694826a0fabcde25de69cc7ebbf66c05c8937bcd
Reviewed-by: Magdalena Stojek <magdalena.stojek@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/text/qlocale.cpp

@@ -1332,7 +1332,7 @@ void QLocale::setNumberOptions(NumberOptions options)
 */
 QLocale::NumberOptions QLocale::numberOptions() const
 {
-    return static_cast<NumberOptions>(d->m_numberOptions);
+    return d->m_numberOptions;
 }
 
 /*!