Fix duplicate choices in trigonometry_1

trigonometry_1.html?seed=9&problem=cosTrig1 was broken because of MathJax inconsistently running sometimes before the answers were compared. Instead, run only tmpl first and always run the other modules afterwards.

Test Plan:
trigonometry_1.html?seed=9&problem=cosTrig1 shows three unique answers.

Auditors: emily

CC: eater