[MC-311383] When target game mode is equals of current game mode, `/gamemode` doesn't return a failed message

When using /gamemode command, if target game mode is equals of current game mode, it’s doesn’t return a faailed message.

How ro reproduce

Actual Result

/gamemode command doesn’t not return a failed message.

Expected Result

/gamemode command should return a failed message to report “Target game mode is equals of current game mode“.

Linked issues

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We're tracking this issue in MC-306369, so this ticket is being resolved and linked as a Duplicate.

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