Update app.py

app.py

@@ -76,7 +76,7 @@ print(styles)
 STYLE_NAMES = list(styles.keys())
 DEFAULT_STYLE_NAME = "(无风格)"
 
-def apply_style(style_name: str, positive: str) -> Tuple[str, str]:
+def apply_style(style_name: str, positive: str) -> Tuple[str]:
     p = styles.get(style_name, styles[DEFAULT_STYLE_NAME])
     return p.replace("{prompt}", positive)