fix(AbstractNav): Re-add role attribute to abstract nav

[jmooserific]

Due to changes made in #4031, AbstractNav now needs to explicitly pass role down to Component.

Fixes issue reported in #4313.

Updated tests to catch the problem.

[mxschmitt]

maybe we can also use props.role instead of role in line 123. So we can get rid of the extra prop in line 133.

[taion]

I think having role explicitly spread out in the signature makes it more clear that it's used, and we do often explicitly pass through props in this manner, too.