bug#69563: 29.1; message-forward-make-body-* has too long line

[RwN]

Both functions message-forward-make-body-digest-plain and 
message-forward-make-body-digest-plain has 68 long character length 
for the "start of forwarded line" while it has 66 for the "End" 
part. This cause a problem when format=flowed which use the 
recommended value 66 (RFC2046). Is there any reason the start line has 
2 characters more?

Best,
E.

InGNU Emacs 29.1 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, 
cairo version 1.16.0) of 2023-10-16 built onlaptop
Windowing system distributor 'The X.Org Foundation', 
version11.0.12101004
System Description:Ubuntu 22.04.4 LTS

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