Help: Fix that user registered documentation was auto-removed on windows

We may not use native path separators for internal data.

Task-number: QTCREATORBUG-14249
Change-Id: I0f00db235608e81cfefdd2359378020c7376768f
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/help/docsettingspage.cpp

@@ -103,7 +103,7 @@ void DocSettingsPage::addDocumentation()
         }
 
         addItem(nameSpace, file, true/*user managed*/);
-        m_filesToRegister.insert(nameSpace, QDir::toNativeSeparators(filePath));
+        m_filesToRegister.insert(nameSpace, filePath);
         m_filesToRegisterUserManaged.insert(nameSpace, true/*user managed*/);
 
         // If the files to unregister contains the namespace, grab a copy of all paths added and try to