Remove temp non-null assertion operator

[dapplion]

Added in c9d98ec

discv5/src/keypair/index.ts

Lines 56 to 58 in c9d98ec

	return createKeypair(KeypairType[pub.Type!] as KeypairType, toBuffer(priv.Data!), toBuffer(pub.Data!));
	} else {
	return createKeypair(KeypairType[pub.Type!] as KeypairType, undefined, toBuffer(pub.Data!));