Replace QFileInfo::fileName() with FileName::fileName()

Change-Id: I4852ff215abf25649fc5eac1e922ae901839ca3d
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeeditor.cpp

@@ -257,7 +257,7 @@ QString CMakeDocument::defaultPath() const
 
 QString CMakeDocument::suggestedFileName() const
 {
-    return filePath().toFileInfo().fileName();
+    return filePath().fileName();
 }
 
 //