LibWeb: Remove unnecessary return in ResolvedCSSStyleDeclaration

Author: https://github.com/networkException
Commit: baac3ba60c
Pull-request: https://github.com/SerenityOS/serenity/pull/14472
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/nico

Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp

@@ -420,7 +420,6 @@ Optional<StyleProperty> ResolvedCSSStyleDeclaration::property(PropertyID propert
             .property_id = property_id,
             .value = style->property(property_id),
         };
-        return {};
     }
 
     auto& layout_node = *m_element->layout_node();