override compatible_samplers with Euler

scripts/img2imgalt.py

@@ -120,6 +120,9 @@ class Script(scripts.Script):
     def show(self, is_img2img):
         return is_img2img
 
+    def compatible_samplers(self):
+        return ['Euler']
+    
     def ui(self, is_img2img):
         original_prompt = gr.Textbox(label="Original prompt", lines=1)
         original_negative_prompt = gr.Textbox(label="Original negative prompt", lines=1)