fix: import QAWolf test file

[AyushAgrawal-A2]

ref: https://quadratichq.slack.com/archives/C06Q34HGV8A/p1722640177200679

From QA Wolf

Description:
Steps to reproduce:

1. Login
2. Click "Create file" button in top right | Click "Import file" dropdown and select Quadratic (.grid) file type
   Expected: After creating a file, a new sheet titled "Untitled" is opened. After importing a sheet, the imported sheet is opened in >a new spreadsheet with the title as the file name.
   Actual: Files cannot be created. When clicking "Create file" button - error message at the bottom "Failed to create file. Try >again." When importing a file, no error message, however error in console.
   Video:
   https://www.loom.com/share/494c5cd6b9e8468098f18545b49eccb2?sid=5355cc10-67ab-4819-bc13-90ded338a144
   Priority:
   Unprioritized

Fixes import of QAWolf test file, which has schema 1.5 code runs.

[qa-wolf]

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Name	Status	Preview	Updated (UTC)
quadratic	✅ Ready (Inspect)	Visit Preview	Aug 5, 2024 11:07pm

[codecov]

Codecov Report

Attention: Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.18%. Comparing base (83fb591) to head (e0e452c).
Report is 18 commits behind head on qa.

Files	Patch %	Lines
quadratic-core/src/grid/file/v1_5/file.rs	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               qa    #1643      +/-   ##
==========================================
+ Coverage   89.88%   90.18%   +0.29%     
==========================================
  Files         191      191              
  Lines       36759    36784      +25     
==========================================
+ Hits        33041    33172     +131     
+ Misses       3718     3612     -106     

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[AyushAgrawal-A2]

for remaining code cov, I'll have to make it panic

[ddimaria]

Great addition 🙌