(fix) Injector optional options removal - preview instance

[cawhitecode]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• 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?

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

What is the current behavior?

Issue Number: 2581

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 68b5879f-b5e9-406a-9e96-cf2c2fdeb461

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 92.261%

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Totals
Change from base Build 3770aab0-7e99-46e0-b1a8-34ce234c1890:	0.001%
Covered Lines:	6688
Relevant Lines:	7249

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💛 - Coveralls

[kamilmysliwiec]

This PR doesn't fix #2581