🎨 chore(generate_image): Update generate_image module

- Set `self.parameters.sm` and `self.parameters.sm_dyn` to `False` when the
  action is IMG2IMG
- Update warning message for infill mode requiring a mask
- Refactor code for setting `self.parameters.extra_noise_seed`

src/novelai_python/sdk/ai/generate_image/__init__.py

@@ -179,6 +179,9 @@ def validate_model(self):
             logger.warning("Mask maybe required for infill mode.")
         if self.action != Action.GENERATE:
             self.parameters.extra_noise_seed = self.parameters.seed
+        if self.action == Action.IMG2IMG:
+            self.parameters.sm = False
+            self.parameters.sm_dyn = False
         return self
 
     @property