fix(gds): fix GDS unit checks during import

[rohanku]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 40.76%. Comparing base (b6c945a) to head (7e08940).

Files	Patch %	Lines
substrate/src/layout/gds.rs	40.00%	0 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #397      +/-   ##
==========================================
+ Coverage   40.64%   40.76%   +0.11%     
==========================================
  Files         170      170              
  Lines       22081    22078       -3     
  Branches     9362     9360       -2     
==========================================
+ Hits         8975     8999      +24     
+ Misses       6973     6972       -1     
+ Partials     6133     6107      -26     

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