Remove Python 3.9+ exclusive code from WebHost options.py.

`str.removeprefix` was added in Python 3.9, so this causes WebHost to return a 500 error if running on Python 3.8.

WebHostLib/options.py

@@ -234,7 +234,7 @@ def generate_yaml(game: str):
         # Detect random-* keys and set their options accordingly
         for key, val in options.copy().items():
             if key.startswith("random-"):
-                options[key.removeprefix("random-")] = "random"
+                options[key[len("random-"):]] = "random"
                 del options[key]
 
         # Error checking

worlds/musedash/MuseDashData.txt

@@ -553,7 +553,7 @@ NOVA|73-4|Happy Otaku Pack Vol.19|True|6|8|10|
 Heaven's Gradius|73-5|Happy Otaku Pack Vol.19|True|6|8|10|
 Ray Tuning|74-0|CHUNITHM COURSE MUSE|True|6|8|10|
 World Vanquisher|74-1|CHUNITHM COURSE MUSE|True|6|8|10|11
-Territory Battles|74-2|CHUNITHM COURSE MUSE|True|5|7|9|
+Tsukuyomi Ni Naru|74-2|CHUNITHM COURSE MUSE|False|5|7|9|
 The wheel to the right|74-3|CHUNITHM COURSE MUSE|True|5|7|9|11
 Climax|74-4|CHUNITHM COURSE MUSE|True|4|8|11|11
 Spider's Thread|74-5|CHUNITHM COURSE MUSE|True|5|8|10|12