fix(plugin): Period Over Period KPI Plugin Feature flag value

[Antonio-RiveroMartnez]

SUMMARY

The enum value of the Feature Flag used by PoP KPI Plugin got changed with latest formatting, so this PR is fixing it so it can be properly used.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8137833) 67.20% compared to head (27e25b2) 67.20%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #26985   +/-   ##
=======================================
  Coverage   67.20%   67.20%           
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  Files        1899     1899           
  Lines       74346    74346           
  Branches     8263     8263           
=======================================
  Hits        49964    49964           
  Misses      22333    22333           
  Partials     2049     2049           

Flag	Coverage Δ
javascript	56.93% <ø> (ø)

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