Some commands should require arguments in `texvc` and `texvccheck`

The \overbrace, \overleftarrow, \overleftrightarrow, \overline,
\overrightarrow, \underbrace, \underline, \widehat, and \widetilde
commands take a single mandatory argument.  Move \overbrace and
\underbrace to the fun_ar1nb list, since they handle trailing
subscripts and superscripts specially.  Move the other functions to
the fun_ar1 list.

Change-Id: I449c8611eeb2eaa7ccb30d3b325975868a160f95