Unable to delete a key with at_cli

[cconstab]

Describe the bug
Unable to delete key using the at_cli app

To Reproduce
Steps to reproduce the behavior:

1. First created a key with @ wavi
2. tried to delete it with at_cli

Expected behavior
key should be deleted

Screenshots

pi@serverlan:~/ai6bh $ ./atcli -v scan
["about.wavi@ai6bh","custom_aprsfromaprs.fi.wavi@ai6bh","custom_handheld.wavi@ai6bh","custom_kenwoodth-d74.wavi@ai6bh","custom_mobileradios.wavi@ai6bh","custom_normallytobefoundon.wavi@ai6bh","custom_qsy.wavi@ai6bh","custom_workingconditionsatqth.wavi@ai6bh","email.wavi@ai6bh","firstname.wavi@ai6bh","image.wavi@ai6bh","lastname.wavi@ai6bh","linkedin.wavi@ai6bh","location.wavi@ai6bh","locationnickname.wavi@ai6bh","privateaccount.wavi@ai6bh","publickey@ai6bh","signing_publickey@ai6bh","twitter.wavi@ai6bh"]
pi@serverlan:~/ai6bh $ ./atcli -v plookup -k custom_qsy.wavi
{"label":"QSY","category":"SOCIAL","type":"Text","value":"I am QRT for now ","valueLabel":""}
pi@serverlan:~/ai6bh $ ./atcli -v plookup -k custom_normallytobefoundon.wavi
{"label":" Normally to be found on","category":"SOCIAL","type":"Text","value":"DStar 1C and 20m","valueLabel":""}
pi@serverlan:~/ai6bh $ ./atcli -v delete -k custom_normallytobefoundon.wavi
1163
pi@serverlan:~/ai6bh $ ./atcli -v plookup -k custom_normallytobefoundon.wavi
{"label":" Normally to be found on","category":"SOCIAL","type":"Text","value":"DStar 1C and 20m","valueLabel":""}
pi@serverlan:~/ai6bh $

The key should be deleted !

Smartphone (please complete the following information):

• Latest trunk version of at_cli

Were you using an @‎application when the bug was found?

• @ wavi

Additional context
Add any other context about the problem here.