Fixup #717 "Add the project name to declarative inputs"
```
Mar 10 16:22:35 hydra-b hydra-evaluator[41419]: DBIx::Class::Storage::DBI::_dbh_execute(): DBI Exception: DBD::Pg::st execute failed: ERROR: null value in column "type" violates not-null constraint
Mar 10 16:22:35 hydra-b hydra-evaluator[41419]: DETAIL: Failing row contains (62358, projectName, 0, null, null, null, hackworthltd, null, , null). [for Statement "INSERT INTO jobsetevalinputs ( altnr, dependency, eval, name, path, revision, sha256hash, type, uri, value) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )" with ParamValues: 1='0', 2=undef, 3='62358', 4='projectName', 5='', 6=undef, 7=undef, 8=undef, 9=undef, 10='hackworthltd'] at /nix/store/cmqblv437mp57yz5lwvkzcqca4ldf3r5-hydra-0.1.20210308.ebf1cd2/bin/.hydra-eval-jobset-wrapped line 793
Mar 10 16:22:35 hydra-b hydra-evaluator[25828]: evaluation of jobset ‘hackworthltd:.jobsets (jobset#1)’ failed with exit code 1
```
Use the abstraction for creating inputs for simulating the project
name input.
Co-authored-by: Graham Christensen <graham@grahamc.com>
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