Fix SVG Preview size

The URL of the SVG preview normally don't have an SVG extension, but it contains svg in the given asset URL. There is a (rare) possibility, that the asset hash of a non-SVG image will also contain that three characters, but it does not seem like a big deal, because it would only increase the height of outer container.

app/assets/stylesheets/alchemy/archive.scss

@@ -74,7 +74,7 @@
       background: $thumbnail-background;
     }
 
-    &[src*=".svg"]:not([src*="alchemy/missing-image"]) {
+    &[src*="svg"]:not([src*="alchemy/missing-image"]) {
       width: var(--picture-width);
       max-height: var(--picture-height);
     }