Resolves #1472 by adjusting the "click" event handler for the ModalVi…

…ewer (as discovered by @tpendragon)

app/assets/javascripts/modal_viewer.es6

@@ -1,7 +1,7 @@
 export default class ModalViewer {
   constructor() {
     this.element = $(this.selector)
-    $("a", this.element).unbind("click")
+    $("a", this.selector).click((event) => { event.preventDefault() })
     $("body").on("click", this.selector, (event) => {
       event.stopPropagation()
       event.preventDefault()