refactor(vow): tiny minor refactor asVow implementation (#9698)

closes: #XXXX
refs: #XXXX

## Description

Tiny minor refactor that destructures in place to remove a named variable.

Completely non-urgent and non-important. But tiny improvements add up.

### Security Considerations
none
### Scaling Considerations
none
### Documentation Considerations
none
### Testing Considerations
none
### Upgrade Considerations
none

packages/vow/src/vow-utils.js

@@ -94,9 +94,9 @@ export const makeAsVow = makeVowKit => {
     if (isVow(result)) {
       return result;
     }
-    const kit = makeVowKit();
-    kit.resolver.resolve(result);
-    return kit.vow;
+    const { vow, resolver } = makeVowKit();
+    resolver.resolve(result);
+    return vow;
   };
   return harden(asVow);
 };