[PR PATCH] Fix typo in reading body from arg

[rakoo <rakoo@users.noreply.github.com>]

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There is a new pull request by rakoo against master on the mblaze repository

https://github.com/rakoo/mblaze body-arg
https://github.com/leahneukirchen/mblaze/pull/260

Fix typo in reading body from arg
When given a body argument like this:

```
mcom foo@bar -body "this is my body"
```

the body isn't taken into account. This is because we try to `cat` from a file called "this is my body", instead of doing a process substitution for a file that fake-contains "this is my body". I believe it is a typo.

A patch file from https://github.com/leahneukirchen/mblaze/pull/260.patch is attached

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From 98f76924d81b025596e881cfe5b87fd5c1b6bd45 Mon Sep 17 00:00:00 2001
From: Matthieu Rakotojaona <m@rako.space>
Date: Mon, 17 Jun 2024 23:42:16 +0200
Subject: [PATCH] mcom: fix reading from body given in arg

---
 mcom | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mcom b/mcom
index 4e834c6..28f1ddf 100755
--- a/mcom
+++ b/mcom
@@ -287,7 +287,7 @@ fi
 		printf '\n'
 		(
 			IFS=$NL
-			cat -- /dev/null $(printf '%s' "$hdrs" | mhdr -M -h body -)
+			cat -- /dev/null <(printf '%s' "$hdrs" | mhdr -M -h body -)
 		)
 		printf '\n'
 		;;