Fix newest goconst issue: remove duplicated string literal

[tisnik]

Description

Fix newest goconst issue: remove duplicated string literal

Type of change

• Refactor (refactoring code, removing useless files)

Testing steps

To be checked on CI.

Checklist

• make before_commit passes
• updated documentation wherever necessary
• added or modified tests if necessary
• updated schemas and validators in insights-data-schemas in case of input/output change

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (9a62a5b) 59.80% compared to head (1b25490) 59.80%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #227   +/-   ##
=======================================
  Coverage   59.80%   59.80%           
=======================================
  Files           7        7           
  Lines         908      908           
=======================================
  Hits          543      543           
  Misses        326      326           
  Partials       39       39           

Files Changed	Coverage Δ
storage.go	65.34% <50.00%> (ø)

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