Fix default assignment of validate key for payments

Fixes problems with p2ms experienced in issue below.

Related: #1194

src/payments/embed.js

@@ -19,7 +19,7 @@ function p2data (a, opts) {
     !a.data &&
     !a.output
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   typef({
     network: typef.maybe(typef.Object),

src/payments/p2ms.js

@@ -24,7 +24,7 @@ function p2ms (a, opts) {
     !(a.pubkeys && a.m !== undefined) &&
     !a.signatures
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   function isAcceptableSignature (x) {
     return bscript.isCanonicalScriptSignature(x) || (opts.allowIncomplete && (x === OPS.OP_0))

src/payments/p2pk.js

@@ -16,7 +16,7 @@ function p2pk (a, opts) {
     !a.input &&
     !a.signature
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   typef({
     network: typef.maybe(typef.Object),

src/payments/p2pkh.js

@@ -18,7 +18,7 @@ function p2pkh (a, opts) {
     !a.pubkey &&
     !a.input
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   typef({
     network: typef.maybe(typef.Object),

src/payments/p2sh.js

@@ -26,7 +26,7 @@ function p2sh (a, opts) {
     !a.redeem &&
     !a.input
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   typef({
     network: typef.maybe(typef.Object),

src/payments/p2wpkh.js

@@ -21,7 +21,7 @@ function p2wpkh (a, opts) {
     !a.pubkey &&
     !a.witness
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   typef({
     address: typef.maybe(typef.String),

src/payments/p2wsh.js

@@ -28,7 +28,7 @@ function p2wsh (a, opts) {
     !a.redeem &&
     !a.witness
   ) throw new TypeError('Not enough data')
-  opts = opts || { validate: true }
+  opts = Object.assign({ validate: true }, opts || {})
 
   typef({
     network: typef.maybe(typef.Object),