bug#64019: 29.0.91; Fix some tree-sitter :match regexps

[Dmitry Gutov]

On 12/06/2023 17:25, Basil L. Contovounesios via Bug reports for GNU 
Emacs, the Swiss army knife of text editors wrote:
> -      (:match "^DEFUN$" @fn))
> +      (:match "\\`DEFUN\\'" @fn))

FWIW, most of these changes are superfluous, practically speaking, 
because node text for these node types (like 'identifier', in this 
example) cannot include newlines.

So we mostly gain some theoretical increase in strictness, at the 
expense of a few extra chars in the code.

With possible exception of c-ts-mode--c-or-c++-regexp, which I simply 
don't understand to be able to tell one way or another.

So I think we could wait until 29.1's release, for example, and then 
apply this on master.