Bug#1036264: Key usage prompt doesn't show up on X

Package: openssh-client
Version: 1:9.2p1-2
Severity: normal

Hi,

when I add a key with `ssh-add -c id_rsa` to the agent, it doesn't prompt me
on usage of key but rejects it. I had to set the environment variable in the
systemd service. This affects X and Wayland/Gnome.

```ini
[Service]
Environment=DISPLAY=:0
```

Regards Jörg

-- System Information:
Debian Release: 12.0
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.3.0-0-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages openssh-client depends on:
ii  adduser           3.132
ii  libc6             2.36-9
ii  libedit2          3.1-20221030-2
ii  libfido2-1        1.12.0-2+b1
ii  libgssapi-krb5-2  1.20.1-2
ii  libselinux1       3.4-1+b5
ii  libssl3           3.0.8-1
ii  passwd            1:4.13+dfsg1-1+b1
ii  zlib1g            1:1.2.13.dfsg-1

Versions of packages openssh-client recommends:
ii  xauth  1:1.1.2-1

Versions of packages openssh-client suggests:
pn  keychain                         <none>
pn  libpam-ssh                       <none>
pn  monkeysphere                     <none>
ii  ssh-askpass-gnome [ssh-askpass]  1:9.2p1-2

-- no debconf information

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