Don't hide critical info

The developer should see what's wrong even on release builds.
That code hides any mistakes we do in JNI which are pretty critical
for developers because they can't see what's wrong with their code. e.g.

 QtAndroid::activity().callMethod<void>("wrongMethodName")

*silently* fails, which is so wrong!

Change-Id: I8b6a24946dfef716fcd86ab9bba82666974e3991
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

src/corelib/kernel/qjni.cpp

@@ -64,9 +64,7 @@ static QString qt_convertJString(jstring string)
 static inline bool exceptionCheckAndClear(JNIEnv *env)
 {
     if (Q_UNLIKELY(env->ExceptionCheck())) {
-#ifdef QT_DEBUG
         env->ExceptionDescribe();
-#endif // QT_DEBUG
         env->ExceptionClear();
         return true;
     }