Update global_architectures.py

[DomInvivo]

Removed double check of embed_dim/num_heads, discussed in PR #494

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Checklist:

• Was this PR discussed in an issue? It is recommended to first discuss a new feature into a GitHub issue before opening a PR.
• Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• Update the API documentation is a new function is added, or an existing one is deleted.
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[codecov]

Codecov Report

Merging #501 (0e6c932) into main (f698df4) will decrease coverage by 1.77%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #501      +/-   ##
==========================================
- Coverage   71.52%   69.76%   -1.77%     
==========================================
  Files          93       93              
  Lines        8707     8705       -2     
==========================================
- Hits         6228     6073     -155     
- Misses       2479     2632     +153     

Flag	Coverage Δ
unittests	69.76% <ø> (-1.77%)	⬇️

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Components	Coverage Δ
ipu	29.75% <ø> (-19.40%)	⬇️