test: ensure the test path is taken

Author: ivokub

internal/generator/ecdsa/template/ecdsa.test.go.tmpl

@@ -111,6 +111,7 @@ func TestNonMalleability(t *testing.T) {
 		r.Add(r, frMod)
 		buf := r.Bytes()
 		copy(bsig[sizeFr:], buf[:])
+		big.NewInt(1).FillBytes(bsig[:sizeFr])
 
 		var sig Signature
 		_, err := sig.SetBytes(bsig)

internal/generator/edwards/eddsa/template/eddsa.test.go.tmpl

@@ -79,6 +79,7 @@ func TestNonMalleability(t *testing.T) {
 		o.Add(&cp.Order, o)
 		buf := o.Bytes()
 		copy(bsig[sizeFr:], buf[:])
+		big.NewInt(1).FillBytes(bsig[:sizeFr])
 
 		var sig Signature
 		_, err := sig.SetBytes(bsig)