Switch silhouette URL extension to .svg

Consumer modules now ship the four silhouette icons as SVG cameos
instead of PNGs, so the URL builder needs to follow suit.

Author: magicsunday

src/Processor/ImageProcessor.php

@@ -104,7 +104,7 @@ public function getSilhouetteUrl(): string
         ) {
             return $this->module->assetUrl(
                 sprintf(
-                    'images/silhouette-%s.png',
+                    'images/silhouette-%s.svg',
                     $this->individual->sex()
                 )
             );