fix #1404 reset default values with useFieldArray

[bluebill1049]

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Size Change: +115 B (0%)

Total Size: 98.3 kB

Filename	Size	Change
dist/react-hook-form.es.js	15 kB	+16 B (0%)
dist/react-hook-form.ie11.js	43.8 kB	+24 B (0%)
dist/react-hook-form.js	15.1 kB	+39 B (0%)
dist/react-hook-form.min.es.js	8.97 kB	+16 B (0%)
dist/react-hook-form.umd.js	15.4 kB	+20 B (0%)

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