fix: Set default value for form fields #1607

Job	Run time
lint	38s
ubuntu-latest @ Go 1.21	42s
ubuntu-latest @ Go 1.21 -tags nomsgpack	36s
ubuntu-latest @ Go 1.21 -tags "sonic avx"	1m 8s
ubuntu-latest @ Go 1.21 -tags go_json	41s
ubuntu-latest @ Go 1.21 -race	15s
ubuntu-latest @ Go 1.22	37s
ubuntu-latest @ Go 1.22 -tags nomsgpack	41s
ubuntu-latest @ Go 1.22 -tags "sonic avx"	53s
ubuntu-latest @ Go 1.22 -tags go_json	49s
ubuntu-latest @ Go 1.22 -race	15s
macos-latest @ Go 1.21	36s
macos-latest @ Go 1.21 -tags nomsgpack	38s
macos-latest @ Go 1.21 -tags "sonic avx"	39s
macos-latest @ Go 1.21 -tags go_json	43s
macos-latest @ Go 1.21 -race	22s
macos-latest @ Go 1.22	36s
macos-latest @ Go 1.22 -tags nomsgpack	34s
macos-latest @ Go 1.22 -tags "sonic avx"	34s
macos-latest @ Go 1.22 -tags go_json	50s
macos-latest @ Go 1.22 -race	20s
	13m 7s

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