imagestable: request.json link now non-styled

By adding custom CSS For the `ib-subdued-link` class the link now looks
like normal text. This approach was chosen as other approaches such as
clicking a non-rendered link cause serious ruckus in the test suite.

This resolves: #805.

src/Components/ImagesTable/ImagesTable.js

@@ -181,10 +181,11 @@ const ImagesTable = () => {
     {
       title: (
         <a
+          className="ib-subdued-link"
           href={`data:text/plain;charset=utf-8,${encodeURIComponent(
             JSON.stringify(compose.request)
           )}`}
-          download="request.json"
+          download={`request-${compose.id}.json`}
         >
           Download compose request (.json)
         </a>

src/Components/ImagesTable/ImagesTable.scss

@@ -8,3 +8,13 @@
     // Remove border between a compose and its expanded detail
     border-bottom-style: none;
 }
+
+.ib-subdued-link {
+    color: inherit;
+    text-decoration: none;
+
+    &:hover {
+        color: inherit;
+        text-decoration: none;
+    }
+}