fix: Use "Flagsmith" as default TOTP issuer

[rolodato]

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Changes

Updates the default TOTP issuer name to "Flagsmith". This is shown by some authenticator apps to distinguish between TOTP secrets.

How did you test this code?

Tested by reading a locally-generated QR code into a few authenticator apps:

Google Authenticator

Microsoft Authenticator

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jan 13, 2025 1:49pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jan 13, 2025 1:49pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jan 13, 2025 1:49pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4992	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4992	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4992	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4992	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4992	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4992	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-59838 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (2fe4e02) to head (2873542).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4992   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files        1191     1191           
  Lines       41630    41633    +3     
=======================================
+ Hits        40546    40549    +3     
  Misses       1084     1084           

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