Fix organize imports for inner class of super class

Consider the following:
```groovy
package p
import p.A.B

abstract class A {
  protected static class B {
  }
}

class C extends A {
  def m(B b) {
  }
}
```

The import statement is not required to resolve reference to B from class C.  Organize Imports (Ctrl+Shift+O) is not removing the extra import.