fix(appx): Invalid code signing tool when building for windows 10 arm64

[shibayan]

Fixes an error when generating appx for Windows 10 arm64 due to referencing a non-existent winCodeSign path. When building for arm64, the x64 version of winCodeSign is used.

Error log

  ⨯ Exit code: ENOENT. spawn C:\Users\shibayan\AppData\Local\electron-builder\Cache\winCodeSign\winCodeSign-2.6.0\windows-10\arm64\makeappx.exe ENOENT  stackTrace=
      Error: Exit code: ENOENT. spawn C:\Users\shibayan\AppData\Local\electron-builder\Cache\winCodeSign\winCodeSign-2.6.0\windows-10\arm64\makeappx.exe ENOENT
          at C:\Users\shibayan\Documents\electron-quick-start\node_modules\builder-util\src\util.ts:125:16
          at exithandler (child_process.js:310:5)
          at ChildProcess.errorhandler (child_process.js:322:5)
          at ChildProcess.emit (events.js:310:20)
          at Process.ChildProcess._handle.onexit (internal/child_process.js:273:12)
          at onErrorNT (internal/child_process.js:469:16)
          at processTicksAndRejections (internal/process/task_queues.js:84:21)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] dist: `electron-builder`
npm ERR! Exit status 1