Fix regression with lists as arguments to call()
Fix regression with lists as arguments to call()

This PR fixes a regression with lists as arguments to call when
the calling function has a rest parameter.

Fixes #1622

am11/libsass,errorx666/libsass,am11/libsass,am11/libsass,errorx666/libsass,errorx666/libsass,am11/libsass,errorx666/libsass,am11/libsass