Fix formatting of backend\common\src\helper.py

backend/common/src/helper.py

@@ -231,7 +231,13 @@ def ta_host_parser(ta_host: str) -> tuple[list[str], list[str]]:
 def get_stylesheets() -> list:
     """Get all valid stylesheets from /static/css"""
 
-    stylesheets = ["dark.css", "light.css", "matrix.css", "midnight.css", "custom.css"]
+    stylesheets = [
+        "dark.css",
+        "light.css",
+        "matrix.css",
+        "midnight.css",
+        "custom.css",
+    ]
     return stylesheets