Fix copy-paste error from previous commit

x/auth/signing/verify.go

@@ -35,7 +35,7 @@ func VerifySignature(pubKey cryptotypes.PubKey, signerData SignerData, sigData s
 			}
 		} else {
 			if !pubKey.VerifySignature(signBytes, data.Signature) {
-				return fmt.Errorf("unable to verify single signer eip191 signature %s for signBytes %s", hex.EncodeToString(data.Signature), hex.EncodeToString(signBytes))
+				return fmt.Errorf("unable to verify single signer signature %s for signBytes %s", hex.EncodeToString(data.Signature), hex.EncodeToString(signBytes))
 			}
 		}
 		return nil