FileSystemFilter: Use QFileInfo::fileName instead of FileName::fileName

The input can well be relative, and contain slashes at the end...

Change-Id: Id4fd65474f2b9c23824f7a822c6e29cf443e1058
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/coreplugin/locator/filesystemfilter.cpp

@@ -119,7 +119,7 @@ QList<LocatorFilterEntry> FileSystemFilter::matchesFor(QFutureInterface<LocatorF
     // file names can match with +linenumber or :linenumber
     name = entry;
     const QString lineNoSuffix = EditorManager::splitLineNumber(&name);
-    name = Utils::FileName::fromString(name).fileName();
+    name = QFileInfo(name).fileName();
     foreach (const QString &file, files) {
         if (future.isCanceled())
             break;