components/search-form: Work around gap between focus shadow and submit button (#8678)

I've tried various things to make this work properly, but haven't found a proper solution. This commit works around the issue by slightly offsetting the submit button to the right. I'm not a fan of this "solution", but I've run out of ideas...

Author: Turbo87

app/components/search-form.module.css

@@ -61,7 +61,8 @@
     composes: button-reset from '../styles/shared/buttons.module.css';
 
     position: absolute;
-    right: 0;
+    /* see https://github.com/rust-lang/crates.io/issues/8677 🤷 */
+    right: -.5px;
     top: 0;
     bottom: 0;
     display: inline-grid;