resolver-debug: fix remove-btn command
This PR fixes remove-btn command in resolver-debug.sh script. This bug leads to filling custom commands in LUCi in case of resolver-debug package update
Note: To make things less complicated this PR only fixes problems with remove-btn function. Other changes should be part of https://gitlab.nic.cz/turris/turris-os-packages/-/merge_requests/418
Edited by Josef Schlehofer