Fix minor visual glitch in record-control background (#9170)

Before:
![image](https://github.com/enso-org/enso/assets/1047859/dcf083b2-c169-42a9-a120-4aa730f05962)

After:
![image](https://github.com/enso-org/enso/assets/1047859/7d9b774a-1ccd-4225-9a2d-a313e40e0c4f)

app/gui2/src/components/RecordControl.vue

@@ -34,12 +34,12 @@ const emit = defineEmits<{ recordOnce: []; 'update:recordMode': [enabled: boolea
   user-select: none;
   display: flex;
   place-items: center;
-  backdrop-filter: var(--blur-app-bg);
   gap: 1px;
 }
 
 .control {
   background: var(--color-frame-bg);
+  backdrop-filter: var(--blur-app-bg);
   padding: 8px 8px;
 }