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 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 14.53%. Comparing base (8978081) to head (ce07d94).

Files with missing lines	Patch %	Lines
drizzle/utils.py	0.00%	8 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (8978081) and HEAD (ce07d94). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (8978081)	HEAD (ce07d94)
	10	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #164       +/-   ##
===========================================
- Coverage   97.27%   14.53%   -82.74%     
===========================================
  Files           3        3               
  Lines         220      227        +7     
===========================================
- Hits          214       33      -181     
- Misses          6      194      +188     

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