fix: recycleWorkers to destroy idle workers when runtime changes

[AriPerkkio]

Idle workers are not recycled when runtime changes and isolateWorkers: true option is used.

tinypool/src/index.ts

Lines 1074 to 1081 in 999778e

	if (options?.runtime) {
	this.options.runtime = options.runtime
	}
	// Worker's are automatically recycled when isolateWorkers is enabled
	if (this.options.isolateWorkers) {
	return
	}

This bug was introduced in https://github.com/tinylibs/tinypool/pull/65/files#diff-a2a171449d862fe29692ce031981047d7ab755ae7f84c707aef80701b3ea0c80R1073 where runtime changing during recycleWorkers was introduced.

[AriPerkkio]

This test fails with following error when fix is reverted:

  ● isolated idle workers change runtime after recycle

expect(received).resolves.toMatchObject(expected)

- Expected  - 2
+ Received  + 8

  Array [
    Object {
-     "isChildProcess": true,
+     "isTinypoolWorker": true,
+     "isWorkerThread": true,
+     "workerData": undefined,
+     "workerId": 2,
    },
    Object {
-     "isChildProcess": true,
+     "isTinypoolWorker": true,
+     "isWorkerThread": true,
+     "workerData": undefined,
+     "workerId": 1,
    },
  ]