Libraries: Use default constructors/destructors in LibWeb

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Libraries/LibWeb/HTML/Scripting/Script.cpp

@@ -14,8 +14,6 @@ Script::Script(AK::URL base_url, String filename)
 {
 }
 
-Script::~Script()
-{
-}
+Script::~Script() = default;
 
 }