Fix type inferencing and syntax highlighting for trait static method referenced from static method

[eric-milles]

Consider the following:

trait T {
  static one() {
  }
  static two() {
    one()
  }
}

GROOVY-8824 introduced a new method call transformation. "one()" is replaced by "this.one($static$self)". This results in "one" being highlighted as unknown (underlined).

[eric-milles]