LibJS: Remove unused Accessor::call_{getter,setter}()

If only we had such "a way to communicate to our caller if an exception
happened" - too bad it's dead code :^)

Userland/Libraries/LibJS/Runtime/Accessor.h

@@ -31,21 +31,6 @@ class Accessor final : public Cell {
  FunctionObject* setter() const { return m_setter; }
  void set_setter(FunctionObject* setter) { m_setter = setter; }
 
- Value call_getter(Value this_value)
- {
- if (!m_getter)
- return js_undefined();
- return TRY_OR_DISCARD(vm().call(*m_getter, this_value));
- }
-
- void call_setter(Value this_value, Value setter_value)
- {
- if (!m_setter)
- return;
- // FIXME: It might be nice if we had a way to communicate to our caller if an exception happened after this.
- [[maybe_unused]] auto rc = vm().call(*m_setter, this_value, setter_value);
- }
-
  void visit_edges(Cell::Visitor& visitor) override
  {
  visitor.visit(m_getter);