fix:  downlevel constructor parameters transformer with tsickle
fix:  downlevel constructor parameters transformer with tsickle

Only run `downlevelConstructorParameters` when `annotateForClosureCompiler` is not enabled since tsickle will downlevel the ctor params anyways.

Closes #1517

dherges/ng-packagr,dherges/ng-packagr,dherges/ng-packagr,dherges/ng-packagr