fix(ui): ignore **/api/** from service worker cache

[robertsLando]

Fixes #3427

[coveralls]

Pull Request Test Coverage Report for Build 7622338398

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• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 22.118%

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Totals
Change from base Build 7614832926:	-0.03%
Covered Lines:	3764
Relevant Lines:	18093

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💛 - Coveralls