QmlJS: Don't use QDir::separator() for internal paths

We use forward slashes in all internal paths, even on Windows.

Change-Id: Ie0b418c770dad96829dd357fe425616b6d3a5b82
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>

src/libs/qmljs/qmljsinterpreter.h

@@ -961,7 +961,7 @@ public:
     // Other: non-absolute path
     QString name() const;
 
-    // LibraryImport: uri with QDir::separator separator
+    // LibraryImport: uri with '/' separator
     // Other: absoluteFilePath
     QString path() const;