ci: run vfmt over sha256_test.v

vlib/crypto/sha256/sha256_test.v

@@ -12,6 +12,5 @@ fn test_crypto_sha256_writer() {
 	digest.write('This is a'.bytes()) or { assert false }
 	digest.write(' sha256 checksum.'.bytes()) or { assert false }
 	sum := digest.sum([])
-	assert sum.hex() ==
-		'dc7163299659529eae29683eb1ffec50d6c8fc7275ecb10c145fde0e125b8727'
+	assert sum.hex() == 'dc7163299659529eae29683eb1ffec50d6c8fc7275ecb10c145fde0e125b8727'
 }