[temp.deduct.call] Make sure that when math superscript is suffixed to \texttt, the \texttt itself is included in the formula passed to MathJax.

Otherwise cxxdraft-htmlgen passes a lone math superscript to MathJax and then applies our own \texttt styling to the result, which produces
a different result from letting MathJax render and style the whole thing.

Author: Eelis

source/templates.tex

@@ -7410,7 +7410,7 @@
 \tcode{A})
 as described below.
 If removing references and cv-qualifiers from \tcode{P} gives
-\tcode{std::initializer_list<P$^{\prime}$>}
+$\tcode{std::initializer_list<P}^{\prime}\tcode{>}$
 or $\tcode{P}'\tcode{[N]}$
 for some $\tcode{P}'$ and \tcode{N} and the
 argument is a non-empty initializer list\iref{dcl.init.list}, then deduction is