chore(nb): re-execute LaTeX.ipynb with deferred-simp build approach

Updated stored outputs reflect the deferred-simp implementation:
- identity simplifier during Ga.build (metric components unsimplified)
- trigsimp(method='old') active during output formatting (_sympystr)

Output is identical to the PR pygae#590 (fix/issue-576-notebook-simp) approach
since both ultimately apply trigsimp(method='old') once per printed
expression.

Author: utiberious