Utils: Replace FileChooser::path() by filePath().toString()

Keep the old method for now to ease downstream porting.

The change is kept mechanical, there's a lot of cleanup possible now
on the user code side.

Change-Id: I936baedd45b7ba057f1c789a1bec896886f48eff
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/python/pythonsettings.cpp

@@ -79,7 +79,7 @@ public:
 
     Interpreter toInterpreter()
     {
-        return {m_currentId, m_name->text(), FilePath::fromUserInput(m_executable->path())};
+        return {m_currentId, m_name->text(), FilePath::fromUserInput(m_executable->filePath().toString())};
     }
     QLineEdit *m_name = nullptr;
     PathChooser *m_executable = nullptr;