QmlProfiler: Properly prepare the file finder on every start

We want to examine the current list of projects, also if we don't have a
specific runConfiguration. Also, after repopulating the file finder, we
need to clear the cache of file mappings, as they might have changed.

Change-Id: I351789fe999009d443ca5ade9b365bfd490e0e23
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qmlprofiler/qmlprofilerdetailsrewriter.cpp

@@ -256,6 +256,7 @@ void QmlProfilerDetailsRewriter::populateFileFinder(
     m_projectFinder.setProjectDirectory(projectDirectory);
     m_projectFinder.setProjectFiles(sourceFiles);
     m_projectFinder.setSysroot(activeSysroot);
+    m_filesCache.clear();
 }
 
 } // namespace Internal