Utils: Use FilePath::toString() for logging reasons

Change-Id: Id3a26327994e55a8d400739e9b7a6e7dcb9b99c5
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/filepath.cpp

@@ -57,7 +57,7 @@
 QT_BEGIN_NAMESPACE
 QDebug operator<<(QDebug dbg, const Utils::FilePath &c)
 {
-    return dbg << c.toUserOutput();
+    return dbg << c.toString();
 }
 
 QT_END_NAMESPACE