Revert "Erase needs of job in SingleWorkflow (#9)" (#32)

This reverts commit 1ba076d321.

`EraseNeeds` Shouldn't be used in `jobparser.Parse`, it's for 023e61e678/models/actions/run.go (L200)

Or Gitea won't be able to get `Needs` of jobs.

Reviewed-on: https://gitea.com/gitea/act/pulls/32
Reviewed-by: Zettat123 <zettat123@noreply.gitea.io>

pkg/jobparser/jobparser.go

@@ -50,7 +50,6 @@ func Parse(content []byte, options ...ParseOption) ([]*SingleWorkflow, error) {
 				runsOn[i] = evaluator.Interpolate(v)
 			}
 			job.RawRunsOn = encodeRunsOn(runsOn)
-			job.EraseNeeds() // there will be only one job in SingleWorkflow, it cannot have needs
 			ret = append(ret, &SingleWorkflow{
 				Name:     workflow.Name,
 				RawOn:    workflow.RawOn,