As the output of some shell-command is not per se delimited to one single
value, registering it creates a list.
Thus, using "{{ some_list }}" get's you square-brackets around the list of
values - although in your case, it's a list with just one single value.
Besides omitting the parameter, you could for instance join the list to a
string: "{{ drive_for_lvm | join '' }}", see
https://docs.ansible.com/ansible/playbooks_filters.html#id7
... or you could limit the list to its first element, either with "{{
drive_for_lvm[0] }}" or "{{ drive_for_lvm | first }}", see again the
filters or
https://docs.ansible.com/ansible/playbooks_variables.html#accessing-complex-variable-data
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