Fix: When domain reload disabled dispatchers doesnt work as expected.…

[wewrere41]

If the domain reload is disabled, it does not reset some data. Thus it doesnt create MainThreadDispatcher on the scene, and its executes actions on EditorThreadDispatcher. Therefore unirx api works unexpectedly.

• This situation only affects the editor and provides a solution for the editor.
  #fix TimeScale doesnt effect to Observable.Timer(Scheduler.MainThread) #520

[qipa]

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