Update app.py

app.py

@@ -173,7 +173,7 @@ def generate(logo=None, Vtubername=""):
       logo_width = logo.width
       target_caption_width = int(logo_width)
       logo_height = logo.height
-      target_caption_width = int(logo_height)
+      target_caption_height = int(logo_height)
 
       if caption.width > target_caption_width:
           aspect_ratio = caption.height / caption.width