fix(parser): fix bug in SPICE exponent parser

[rahulk29]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (acb25d5) 40.80% compared to head (5fa4a5b) 40.83%.

Files	Patch %	Lines
libs/spice/src/parser/conv.rs	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #366      +/-   ##
==========================================
+ Coverage   40.80%   40.83%   +0.03%     
==========================================
  Files         167      167              
  Lines       21276    21277       +1     
  Branches     8945     8943       -2     
==========================================
+ Hits         8682     8689       +7     
+ Misses       6696     6695       -1     
+ Partials     5898     5893       -5     

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