QDataStream: code tidies

As spotted in the code review, remove_cv here is useless. Since T is
passed by value, template type deduction will strip cv-ref for us.

(Also: in general we don't support users specifying template type
parameters except where authorized, but here they can't, as this is an
operator.)

Amends 3823e310e39426043dc7f0529a6fba33fe4d49f0

Change-Id: I5b5db38a4dcf4f1179d748cf0bb1b62a9896f5a6
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/serialization/qdatastream.h

@@ -173,7 +173,7 @@ public:
 #if !defined(Q_QDOC)
     // Disable implicit conversions to bool (e.g. for pointers)
     template <typename T,
-             std::enable_if_t<std::is_same_v<std::remove_cv_t<T>, bool>, bool> = true>
+             std::enable_if_t<std::is_same_v<T, bool>, bool> = true>
     QDataStream &operator<<(T i)
     {
         return (*this << qint8(i));