fix(cros_setup_toolchains): Fix typo added in "Add --nogetbinpkg"

This fixes an error in commit c6abf88f5e729e8a2cf3a71eba70a9feb14ac4fb
Merge pull request #3 from marineam/fix-getbinpkg

fix(cros_setup_toolchains): Fix typo added in "Add --nogetbinpkg"