Fix summary hint scheme for excluding elements

[munrojm]

Ensures summary hint scheme accommodates exclude_elements

[codecov-commenter]

Codecov Report

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

Comparison is base (3b5815e) 90.85% compared to head (130e0ca) 90.84%.

Files	Patch %	Lines
.../emmet/api/routes/materials/summary/hint_scheme.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #906      +/-   ##
==========================================
- Coverage   90.85%   90.84%   -0.01%     
==========================================
  Files         137      137              
  Lines       12820    12826       +6     
==========================================
+ Hits        11647    11652       +5     
- Misses       1173     1174       +1     

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