Make it a string in accordance to the return value type

allianceauth/templatetags/admin_status.py

@@ -39,7 +39,7 @@ logger = logging.getLogger(__name__)
 @register.simple_tag()
 def decimal_widthratio(this_value, max_value, max_width) -> str:
     if max_value == 0:
-        return 0
+        return str(0)
 
     return str(round(this_value/max_value * max_width, 2))