Remove signature from reactions on the receiver

[link2xt]

Reactions do not have footer since #4759. However, mailing lists still add the footer to the messages, and receiver interprets words as a reaction.

Here is how it looks like on the receiver side:

Here is the reaction message with irrelevant headers cleaned up:

Content-Disposition: reaction
To: <offtopic@hispanilandia.net>
Date: Sun, 01 Oct 2023 23:10:16 +0000
Message-ID: <Mr.NiTbPTxb1-U.oaNME1wW5jz@hispanilandia.net>
In-Reply-To: <Mr.kP-5VCy5c_q.tTczYodyS4p@hispanilandia.net>
References: <Mr.-rWbTJ3uAyD.-db4njcneh9@testrun.org>
	<Mr.kP-5VCy5c_q.tTczYodyS4p@hispanilandia.net>
Chat-Version: 1.0
MIME-Version: 1.0
Message-ID-Hash: H26P3MPRGGQN224KDQJLIG72EIRRQP7P
From: asiel <f7186f2b-a84e-449e-b916-2f03a80b57cc@hispanilandia.net>
Precedence: list
Reply-To: offtopic@hispanilandia.net
List-Id: Global Offtopic <offtopic.hispanilandia.net>
List-Help: <mailto:offtopic-request@hispanilandia.net?subject=help>
List-Owner: <mailto:offtopic-owner@hispanilandia.net>
List-Post: <mailto:offtopic@hispanilandia.net>
List-Subscribe: <mailto:offtopic-join@hispanilandia.net>
List-Unsubscribe: <mailto:offtopic-leave@hispanilandia.net>
Content-Type: text/plain; charset="utf-8"; format="flowed"; delsp="no"
Content-Transfer-Encoding: base64

8J+Yjg0KDQotLSAKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X18KR2xvYmFsIE9mZnRvcGljIG1haWxpbmcgbGlzdCAtLSBvZmZ0b3BpY0BoaXNwYW5pbGFuZGlh
Lm5ldApUbyB1bnN1YnNjcmliZSBzZW5kIGFuIGVtYWlsIHRvIG9mZnRvcGljLWxlYXZlQGhpc3Bh
bmlsYW5kaWEubmV0Cg==

base64 part decodes to this:

😎

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