fix(solo): clean up unnecessary deep captp import

Author: michaelfig

packages/captp/src/index.js

@@ -1,6 +1,5 @@
-import { Nat } from '@agoric/nat';
+export { Nat } from '@agoric/nat';
 
 export * from '@agoric/marshal';
 
 export * from './captp.js';
-export { Nat };

packages/solo/src/captp.js

@@ -1,7 +1,4 @@
-// Avoid importing the full captp bundle, which would carry
-// in its own makeHardener, etc.
-import { makeCapTP } from '@agoric/captp/lib/captp';
-import { E } from '@agoric/eventual-send';
+import { E, makeCapTP } from '@agoric/captp';
 
 export const getCapTPHandler = (
   send,