Detect Animation only for mediaProxy

Works without, but this should suppress CORS browser errors

src/components/still-image/still-image.js

@@ -43,11 +43,12 @@ const StillImage = {
         this.isAnimated = true
         return
       }
+      // harmless CORS errors without-- clean console with
+      if (!this.$store.state.instance.mediaProxyAvailable) return
       // Animated JPEGs?
       if (!(this.src.endsWith('.webp') || this.src.endsWith('.png'))) return
       // Browser Cache should ensure image doesn't get loaded twice if cache exists
       fetch(image.src, {
-        mode: 'cors',
         referrerPolicy: 'same-origin'
       })
         .then(data => {