Fix #3168 Don't insert apply if tree has method type
Fix #3168 Don't insert apply if tree has method type

It would be simply an eta-expansion followed by an application.
As #3168 shows, overloading resolution gets confused by this.

lampepfl/dotty,som-snytt/dotty,lampepfl/dotty,som-snytt/dotty,lampepfl/dotty,dotty-staging/dotty,sjrd/dotty,som-snytt/dotty,dotty-staging/dotty,lampepfl/dotty,sjrd/dotty,sjrd/dotty,sjrd/dotty,sjrd/dotty,lampepfl/dotty,dotty-staging/dotty,dotty-staging/dotty,som-snytt/dotty,dotty-staging/dotty,som-snytt/dotty