[NTG-context] Change font in \startuseMPgraphic

[Alfredo Catalina]

> \setupbodyfont[pagella,11pt]
>
> %\setupMPinstance[metafun][textstyle=sans]
> \setupMPinstance[metafun][textstyle={\switchtobodyfont[termes,14pt]}]
>
> \starttext
>
> \input knuth
>
> \startMPcode
> draw textext("I’m different!") ;
> \stopMPcode
>
> \stoptext
>
>
>

It gives an error:

! Undefined control sequence.
system          > tex > error on line 1 in file GeneraMapa.tex: Undefined
control sequence ...
1 >>  \setupMPinstance[metafun][textstyle={\switchtobodyfont[termes,14pt]}]
2
3     \setuppagenumbering[location=]
4     \starttext
5     \input ./mapa.tex
6     \useMPgraphic{mapa}
7     \stoptext
8
l.1 \setupMPinstance
                    [metafun][textstyle={\switchtobodyfont[termes,14pt]}]
?
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