fix(local-storage): removes duplicate createKey calls

[fasidOnGit]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: 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?

Clearing cache while using the Localstorage strategy does not remove the cache and ttl from local storage.

Issue Number: #76

What is the new behavior?

calling clear() will now successfully removes respective cache items from localstorage.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

this is my first PR. yay 🎉

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