Forces radio buttons to be correctly centred (#34389)

app/javascript/styles/mastodon/components.scss

@@ -7572,14 +7572,11 @@ a.status-card {
 }
 
 .radio-button__input.checked::before {
-  position: absolute;
-  left: 2px;
-  top: 2px;
   content: '';
   display: block;
   border-radius: 50%;
-  width: 12px;
-  height: 12px;
+  width: calc(100% - 4px);
+  height: calc(100% - 4px);
   background: $ui-highlight-color;
 }