Workaround to duplicate decorators

[MementoRC]

Related to: #55
Observation:

• When Asyncifing a decorated function, the decorators are duplicated
  Understanding:
• In apply() method of_ReplaceCodeSegmentAction, the lines exclude the decorators (from position_for())
• Building the replacement is based on the context, which includes the decorators
• Replacing the lines slice with the replacement ends up duplicating the decorators
  Proposal:
• A possible solution is to include the decorators in the lines since _resyntesize() works with the
  context that includes the decorators