bitscope: refactored to pass nixpkgs-lint

The linter (nixpkgs-lint) was not able to find the bitscope packages
because `recurseIntoAttrs` was not applied to the suite's set.

The name supplied to `buildFHSUserEnv` produces a binary that
corresponds to the binary names in the deb packages (e.g.: bitscope-dso,
bitscope-chart, bitscope-logic, etc), however; this name does not
constitute a valid nixpkgs name. Valid nixpkgs names satisfy the
`/(.*)(-[0-9].*)$/` pattern, therefore a valid name is merged into the
derivation produced by `buildFHSUserEnv`.