Make testsuite emu/plugins/tdl pass on >= go1.20

Prior to Go 1.20 the pseudo-random number generator was seeded like Seed(1)
at program startup, but in later releases the generator is seeded randomly.

Since the testcase "typeDef1" uses the "rand" op the testcase output does
not always match the expected file: unit-test/exp/typeDef1.json
This is due to the different random order in Go 1.20+. By setting seed=1,
as previously done by Go itself, we get the same result in all Go version.

- Testcase
  "params":
  {
    "size": 6,
    "offset": 0,
    "op": "rand",
    "list": ["TRex", "Cisco", "Golang"]
  }

- Go doc:
  https://pkg.go.dev/math/rand@master#Seed

Author: bjosv

src/emu/plugins/tdl/tdl_test.go

@@ -561,6 +561,7 @@ func TestTypeDef1(t *testing.T) {
 		initJSON:     [][]byte{[]byte(initJson)},
 		duration:     10 * time.Second,
 		clientsToSim: 1,
+		seed:         1,
 	}
 	a.Run(t, true)
 }