Libraries: Use default constructors/destructors in LibJS

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/LibJS/Runtime/MathObject.cpp

@@ -75,10 +75,6 @@ void MathObject::initialize(GlobalObject& global_object)
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm, vm.names.Math.as_string()), Attribute::Configurable);
 }
 
-MathObject::~MathObject()
-{
-}
-
 // 21.3.2.1 Math.abs ( x ), https://tc39.es/ecma262/#sec-math.abs
 JS_DEFINE_NATIVE_FUNCTION(MathObject::abs)
 {