LibWeb: Use correct specifier to pad font language override value

Author: https://github.com/tcl3
Commit: 7fe110225b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2424
Reviewed-by: https://github.com/trflynn89

Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -5777,7 +5777,7 @@ RefPtr<CSSStyleValue> Parser::parse_font_language_override_value(TokenStream<Com
         }
         transaction.commit();
         if (length < 4)
-            return StringStyleValue::create(MUST(String::formatted("{<4}", string_value)));
+            return StringStyleValue::create(MUST(String::formatted("{:<4}", string_value)));
         return string;
     }