fix: expose modified pwa context to the config

Author: pi0

lib/module.js

@@ -2,7 +2,8 @@ module.exports = async function nuxtPWA (moduleOptions) {
   const modules = ['icon', 'manifest', 'meta', 'workbox']
 
   // Shared options context
-  const pwa = { ...this.options.pwa, ...moduleOptions }
+  this.options.pwa = { ...(this.options.pwa || {}), ...(moduleOptions || {}) }
+  const { pwa } = this.options.pwa
 
   // Normalize options
   for (const name of modules) {