fix: ensure ref-macros export plays nice with vue-tsc

[LinusBorg]

The fix in 1245709 seems incomplete - it works in VSCode, but vue-tsc still throws:

vue-tsc --noEmit && vite build
src/env.d.ts:2:23 - error TS2688: Cannot find type definition file for 'vue/ref-macros'.
2 /// <reference types="vue/ref-macros" />

it seems that the "exports" entry for the ref-macros should not have the .d.ts extension:

  "exports": {
    // ....
    "./dist/*": "./dist/*",
    "./package.json": "./package.json",
-    "./ref-macros.d.ts": "./ref-macros.d.ts"
+    "./ref-macros": "./ref-macros.d.ts"
  },

Doing that change in an actual plain vite project and running build works without throwing an error.

I used: https://github.com/malobre/vue3-ref-transform-type-reference-bug