fix(spectator): setInput with object parameter for alias names (#691)

[kheos31]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngneat/spectator/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Cannot compile test when we call setInput on more than one input whose one is aliased (object parameter)

Issue Number: #691

What is the new behavior?

We can compile and execute test when we call setInput on more than one input whose one is aliased (object parameter)

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

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