Disable bounding box in calc_pixmap

[mcara]

Prepare for spacetelescope/gwcs#498 by disabling bounding box in calc_pixmap.

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.47%. Comparing base (dab1009) to head (8f8689c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
drizzle/utils.py	96.15%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   97.32%   97.47%   +0.15%     
==========================================
  Files           3        3              
  Lines         224      238      +14     
==========================================
+ Hits          218      232      +14     
  Misses          6        6              

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