Rename TransferTimeoutPreset to DefaultTransferTimeoutConstant

Found in API review. Replacing with the suggested name which is more Qt-ish.
And also preventively fix the name to contain its enum's name to follow the
conventions.

Change-Id: I00b510e36ccc831f107ecc3c79943d617726b4fb
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/network/access/qnetworkaccessmanager.h

@@ -171,7 +171,7 @@ public:
     void setAutoDeleteReplies(bool autoDelete);
 
     int transferTimeout() const;
-    void setTransferTimeout(int timeout = QNetworkRequest::TransferTimeoutPreset);
+    void setTransferTimeout(int timeout = QNetworkRequest::DefaultTransferTimeoutConstant);
 
 Q_SIGNALS:
 #ifndef QT_NO_NETWORKPROXY

src/network/access/qnetworkrequest.cpp

@@ -432,9 +432,9 @@ QT_BEGIN_NAMESPACE
     A constant that can be used for enabling transfer
     timeouts with a preset value.
 
-    \value TransferTimeoutPreset      The transfer timeout in milliseconds.
-                                      Used if setTimeout() is called
-                                      without an argument.
+    \value DefaultTransferTimeoutConstant     The transfer timeout in milliseconds.
+                                              Used if setTimeout() is called
+                                              without an argument.
  */
 
 class QNetworkRequestPrivate: public QSharedData, public QNetworkHeadersPrivate

src/network/access/qnetworkrequest.h

@@ -135,7 +135,7 @@ public:
     };
 
     enum TransferTimeoutConstant {
-        TransferTimeoutPreset = 30000
+        DefaultTransferTimeoutConstant = 30000
     };
 
     QNetworkRequest();
@@ -190,7 +190,7 @@ public:
     void setHttp2Configuration(const QHttp2Configuration &configuration);
 
     int transferTimeout() const;
-    void setTransferTimeout(int timeout = TransferTimeoutPreset);
+    void setTransferTimeout(int timeout = DefaultTransferTimeoutConstant);
 #endif // QT_CONFIG(http) || defined(Q_CLANG_QDOC)
 private:
     QSharedDataPointer<QNetworkRequestPrivate> d;