Switch variables_to_prompt to a set

inni/cli.py

@@ -42,11 +42,11 @@ def _login_out(ctx: click.Context, login: bool):
     console.print("[green]✅ Initialized Modules")
     console.print("")
 
-    variables_to_prompt = []
+    variables_to_prompt = set()
     for module in modules.values():
-        variables_to_prompt += module.template_variables()[
-            "login" if login else "logout"
-        ]
+        variables_to_prompt.update(
+            module.template_variables()["login" if login else "logout"]
+        )
 
     responses = {}
     for var in variables_to_prompt: