Always call setLibraryDebuggable to avoid being affected by defaults.
Always call setLibraryDebuggable to avoid being affected by defaults.

Defaults changed in 1.23 breaking this functionality; so this will
tolerate any default.

Fixes #276.

Dart-Code/Dart-Code,Dart-Code/Dart-Code,Dart-Code/Dart-Code,Dart-Code/Dart-Code,Dart-Code/Dart-Code