Save action should ask the user to save_as the effect, if it doesn't exist

1. Create a new QDS project
2. Go to effect composer without creating a new effect
3. Add an effect node. e.g. `Colorize`
4. Enable the advance mode
5. Open code editor
6. Change something -> The line should become red
7. Save it by pressing Ctrl+S.
8. Since the effect is not saved, it cannot overwrite it. So the line stays red.
9. Go to effect composer and save the effect (It should ask the name for the effect)
10. Then go back to the code editor, and change something.
11. Press Ctrl+s
12. Now, it can overwrite the effect.

Here in the code editor, it's expected that the ui asks for saving the effect with the new name if the effect is not created completely (Is not created for the first time), and the user presses ctrl+s.