[#749] morph/client: reuse TestInvokePrm in InvokePrm

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/morph/client/static.go

@@ -65,9 +65,7 @@ func (s StaticClient) Morph() *Client {
 
 // InvokePrm groups parameters of the Invoke operation.
 type InvokePrm struct {
-	// required parameters
-	method string
-	args   []interface{}
+	TestInvokePrm
 
 	// optional parameters
 	InvokePrmOptional
@@ -84,16 +82,6 @@ type InvokePrmOptional struct {
 	hash *util.Uint256
 }
 
-// SetMethod sets method of the contract to call.
-func (i *InvokePrm) SetMethod(method string) {
-	i.method = method
-}
-
-// SetArgs sets arguments of the contact call.
-func (i *InvokePrm) SetArgs(args ...interface{}) {
-	i.args = args
-}
-
 // SetHash sets optional hash of the transaction.
 // If hash is set and notary is enabled, StaticClient
 // uses it for notary nonce and `validUntilBlock`