Revert agent reload backoff settings (#3937)

[bjee19]

Cherrypick of #3937

Revert changes to agent reload backoff settings due to a fix added in Agent v3.3.1.

Tested SnippetsFilter Functional on NGINX Plus test to ensure changes work.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.90%. Comparing base (f76e38f) to head (6c40670).
⚠️ Report is 1 commits behind head on release-2.1.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.1    #3939      +/-   ##
===============================================
- Coverage        86.92%   86.90%   -0.02%     
===============================================
  Files              128      128              
  Lines            16013    16013              
  Branches            62       62              
===============================================
- Hits             13919    13916       -3     
- Misses            1925     1928       +3     
  Partials           169      169              

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