Bugfix: Move loop_root sentinel value above exhaustive conditionals

[mfisher87]

The development branch doesn't pass integration tests due to this mistake introduced in #593.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 66.68%. Comparing base (74ca632) to head (8cbbcbe).
Report is 1 commits behind head on development.

Files with missing lines	Patch %	Lines
icepyx/core/granules.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #616      +/-   ##
===============================================
- Coverage        71.48%   66.68%   -4.80%     
===============================================
  Files               38       36       -2     
  Lines             3135     3077      -58     
  Branches           600      594       -6     
===============================================
- Hits              2241     2052     -189     
- Misses             783      935     +152     
+ Partials           111       90      -21     

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