avfilter/vf_waveform: fix order of graticule scale items

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_waveform.c

@@ -145,8 +145,8 @@ static const AVOption waveform_options[] = {
     { "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_SCALES-1, FLAGS, "scale" },
     { "s",     "set scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_SCALES-1, FLAGS, "scale" },
         { "digital",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=DIGITAL},    0, 0, FLAGS, "scale" },
-        { "ire",        NULL, 0, AV_OPT_TYPE_CONST, {.i64=IRE},        0, 0, FLAGS, "scale" },
         { "millivolts", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MILLIVOLTS}, 0, 0, FLAGS, "scale" },
+        { "ire",        NULL, 0, AV_OPT_TYPE_CONST, {.i64=IRE},        0, 0, FLAGS, "scale" },
     { NULL }
 };