[MCPE-163309] Spectator mode can get /kill

Reproduce:
1.change yourself to Spectator mode
2./kill in chat

Expected Results:
Didn't get killed and send message like creative mode get /kill

Observed Results:
Players who have Spectator mode get killed

Linked issues

Thank you for your report!
We're tracking this issue in MCPE-153869, so this ticket is being resolved and linked as a duplicate.

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