remove restriction on line length in mutt compose

[Paul Gilmartin]

On 2021-02-13, at 18:37:20, Globe Trotter wrote:
> 
> I appear to have hit some key while using compose in mutt, and the result is that I end on a new line after a certain length of characters in a new line. What controls this? It is not a vi issue because the editor does no wrap after even a very long, as used to be the case until earlier today.
>  
Perhaps obeying RFC 821:
            text line

               The maximum total length of a text line including the
               <CRLF> is 1000 characters (but not counting the leading
               dot duplicated for transparency).

-- gil