SvgIcon: loader fallback

app/soapbox/components/ui/icon/svg-icon.tsx

@@ -29,7 +29,10 @@ const SvgIcon: React.FC<ISvgIcon> = ({ src, alt, size = 24, className }): JSX.El
       height={size}
       loader={loader}
       data-testid='svg-icon'
-    />
+    >
+      /* If the fetch fails, fall back to displaying the loader */
+      {loader}
+    </InlineSVG>
   );
 };