LibWeb: Only dump parsed CSS stylesheet if logging is enabled

Author: https://github.com/AtkinsSJ
Commit: f4b3ab19c0
Pull-request: https://github.com/SerenityOS/serenity/pull/9121
Reviewed-by: https://github.com/Dexesttp ✅
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -173,7 +173,9 @@ NonnullRefPtr<CSSStyleSheet> Parser::parse_as_stylesheet(TokenStream<T>& tokens)
     }
 
     auto stylesheet = CSSStyleSheet::create(rules);
-    dump_sheet(stylesheet);
+    if constexpr (CSS_PARSER_DEBUG) {
+        dump_sheet(stylesheet);
+    }
     return stylesheet;
 }