jshint/jsduck: Include config files in file match filter

Follows-up e14076e, which made jshint/jsduck no longer run
when changing jsduck.json (or jsduck/config.json,
.docs/config.json, etc.), .jshintrc, .jshintignore etc.

Change-Id: I773e84e6f75512fd385df6120634e56d56be7928