[dev] [st] Support the DECSCUSR CSI escape sequence

[Roberto E. Vargas Caballero]

-       csiescseq.mode = *p;
+       csiescseq.mode[0] = *p;
+       p++;
+       if (strchr("q", *p))
+               csiescseq.mode[1] = *p;
 }

The strchr is not needed, you can do something like:

        csiescseq.mode[0] = *p++;
        csiescseq.mode[1] = *p;

if the string has only one character then csiescseq.mode[1] will have
only a '\0', but it is not a problem. And in this way the code is more
generic because it can deal with sequences like:

CSI num $ l (DECSCPP) 

[I don't talk about add this sequence is only an example)

Regards,