Fix objc wrapper request box default inclusion

[julianlocke]

The logic here was incorrect and the correct logic is non-trivial as it requires knowledge of the specs from an unrelated run of stone (stone generates the Swift client and the SwiftObjc client in separate passes). Since an unneeded default is just an warning while a missing one is an error default to using a default, for now.

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Attention: 103 lines in your changes are missing coverage. Please review.

Comparison is base (94fa542) 50.30% compared to head (9146372) 49.94%.
Report is 14 commits behind head on swifty-dropbox-beta.

Files	Patch %	Lines
stone/backends/swift_helpers.py	0.00%	34 Missing ⚠️
stone/backends/swift_client.py	0.00%	26 Missing ⚠️
stone/backends/swift_types.py	0.00%	25 Missing ⚠️
stone/cli.py	0.00%	16 Missing ⚠️
stone/backends/swift.py	0.00%	1 Missing ⚠️
stone/frontend/ir_generator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           swifty-dropbox-beta     #322      +/-   ##
=======================================================
- Coverage                50.30%   49.94%   -0.37%     
=======================================================
  Files                       37       37              
  Lines                     8740     8803      +63     
  Branches                  1881     1888       +7     
=======================================================
  Hits                      4397     4397              
- Misses                    4026     4089      +63     
  Partials                   317      317              

Flag	Coverage Δ
unit	49.94% <0.96%> (-0.37%)	⬇️

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