changed order of feature image

vue-theme/src/components/featured-image.vue

 <template lang="pug">
 .featured-or-hero-image
-    img(v-if="thumb" :src="thumb" alt="post thumbnail")
+    img(v-if="hero && hero.url" :src="getThumbnailFromYt(hero.url)" alt="post thumbnail from YouTube")
     img(v-else-if="featured" :src="featured" alt="post featured")
-    img(v-else-if="hero && hero.url" :src="getThumbnailFromYt(hero.url)" alt="post thumbnail from YouTube")
+    img(v-else-if="thumb" :src="thumb" alt="post thumbnail")
     
     //- Errors
     p(v-else-if="hero && !hero.url") ERROR: hero url undefined