ncurses: Fix bad strncmp

ncurses: Fix bad strncmp

ui/ncurses/nc-cui.c:967:58: warning: size argument in 'strncmp' call is a comparison [-Wmemsize-comparison]
        if (strncmp(cod->opt->id, "dummy", strlen("dummy") == 0 &&
                                           ~~~~~~~~~~~~~~~~~~~~~^~
ui/ncurses/nc-cui.c:967:6: note: did you mean to compare the result of 'strncmp' instead?
        if (strncmp(cod->opt->id, "dummy", strlen("dummy") == 0 &&
            ^

There appears to be two bonus conditions inside the length field. I
chose to drop the  pointless strncmp(foo, bar, strlen(bar)), as this is
equivalent to strcmp(foo, bar).

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
	[Fixed up commit message typo]