refactor(store-devtools): remove unused import

[raphinesse]

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What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[x] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
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What is the current behavior?

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What is the new behavior?

Does this PR introduce a breaking change?

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