PMM-7: fix lint errors

[ritbl]

PMM-7

[codecov[bot]]

Codecov Report

Merging #1128 (8109a5e) into main (ca16a4d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1128   +/-   ##
=======================================
  Coverage   45.52%   45.52%           
=======================================
  Files         140      140           
  Lines       13521    13521           
=======================================
  Hits         6155     6155           
  Misses       6976     6976           
  Partials      390      390           

Flag	Coverage Δ
admin	24.41% <ø> (ø)
agent	54.28% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/github.com/percona/pmm/admin/commands/list.go	10.13% <0.00%> (ø)
...rc/github.com/percona/pmm/admin/commands/status.go	44.00% <0.00%> (ø)
...ercona/pmm/admin/commands/inventory/list_agents.go	2.84% <0.00%> (ø)

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