add data-zoom-src to figure and render-image layouts fixing medium-zoom

layouts/_default/_markup/render-image.html

@@ -32,6 +32,7 @@
         {{ (.Resize "660x").RelPermalink }} 660w,
         {{ (.Resize "1024x").RelPermalink }} 1024w,
         {{ (.Resize "1320x").RelPermalink }} 2x"
+        data-zoom-src="{{ (.Resize "1320x").RelPermalink }}"
         src="{{ (.Resize "660x").RelPermalink }}"
         alt="{{ $altText }}"
       />

layouts/shortcodes/figure.html

@@ -37,6 +37,7 @@
           {{ (.Resize "1024x").RelPermalink }} 1024w,
           {{ (.Resize "1320x").RelPermalink }} 2x"
           src="{{ (.Resize "660x").RelPermalink }}"
+          data-zoom-src="{{ (.Resize "1320x").RelPermalink }}"
           alt="{{ $altText }}"
         />
       {{- end }}