vdisp/sdl3 probe: do output codec_t multiple times

It will actually cause problems to callers those count the occurences
like vdisp/aggregate.

Author: MartinPulec

src/video_display/sdl3.c

@@ -605,9 +605,14 @@ get_ug_to_sdl_format(const struct fmt_data *supp_fmts, codec_t ug_codec)
 static int
 get_supported_pfs(const struct fmt_data *supp_fmts, codec_t *codecs)
 {
+        bool codec_set[VC_COUNT]= {};
         int i = 0;
         for (; supp_fmts[i].ug_codec != VC_NONE; ++i) {
+                if (codec_set[supp_fmts[i].ug_codec]) {
+                        continue;
+                }
                 codecs[i] = supp_fmts[i].ug_codec;
+                codec_set[supp_fmts[i].ug_codec] = true;
         }
         return i;
 }