Reduce number of video frames in set_maps test

BUG=aomedia:506

Change-Id: I29d5c68ffe9bc9f440d7c0e8f2e134dd64267d78

examples/set_maps.c

@@ -123,7 +123,7 @@ int main(int argc, char **argv) {
   aom_codec_ctx_t codec;
   aom_codec_enc_cfg_t cfg;
   int frame_count = 0;
-  const int limit = 30;
+  const int limit = 15;
   aom_image_t raw;
   aom_codec_err_t res;
   AvxVideoInfo info;
@@ -184,9 +184,9 @@ int main(int argc, char **argv) {
   while (aom_img_read(&raw, infile) && frame_count < limit) {
     ++frame_count;
 
-    if (frame_count == 11) {
+    if (frame_count == 5) {
       set_active_map(&cfg, &codec);
-    } else if (frame_count == 22) {
+    } else if (frame_count == 11) {
       unset_active_map(&cfg, &codec);
     }