Use same default installation directory as before.

Task-number: QTCREATORBUG-8009

Change-Id: I16135a0195cd068cb2feddbe0bc9ed2de5c31dba
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
Reviewed-by: Robert Loehning <robert.loehning@digia.com>

dist/installer/ifw/config/config-windows.xml.in

@@ -11,7 +11,7 @@
     <Watermark>watermark.png</Watermark>
     <UninstallerName>QtCreatorUninstaller</UninstallerName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->
-    <TargetDir>@rootDir@/QtCreator/qtcreator-{version}</TargetDir>
+    <TargetDir>@rootDir@/Qt/qtcreator-{version}</TargetDir>
 
     <Pages>
       <Page name="LicenseAgreementPage">