Utils: Use an enum indication the possible abort of an dir iteration

The bool is not really clear.

Change-Id: I4ce6412736aec6b1853fd53d4e535ad045748350
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/qmljstools/qmljsmodelmanager.cpp

@@ -86,7 +86,7 @@ static void findAllQrcFiles(const FilePath &filePath, FilePaths &out)
     filePath.iterateDirectory(
         [&out](const FilePath &path) {
             out.append(path.canonicalPath());
-            return true;
+            return IterationPolicy::Continue;
         },
         {{"*.qrc"}, QDir::Files});
 }