Fixup Re US 130-193: Apply Tim Song's suggested rewording

Author: eisenwave

source/meta.tex

@@ -6899,7 +6899,7 @@
     but $S$ would have no member named \tcode{type}; or
   \item
     the call is specified to return \tcode{$S$::value},
-    but that expression is not a valid converted constant expression of type \tcode{R},
+    but that expression would not be a valid converted constant expression of type \tcode{R},
     where \tcode{R} is the return type of $F$;
   \end{itemize}
   then an exception of type \tcode{meta::exception} is thrown.