correct a misspelled word

[akagaeng]

[coveralls]

Pull Request Test Coverage Report for Build 21

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-35.3%) to 61.765%

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Files with Coverage Reduction	New Missed Lines	%
app/app.ts	12	45.45%
<!--	Total:	12

Totals
Change from base Build 20:	-35.3%
Covered Lines:	18
Relevant Lines:	30

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💛 - Coveralls