fix path to desktop configuration (replace 'frameworks' by 'shared')

[radio-miskovice]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

fix issue #11

• What is the current behavior? (You can also link to an open issue here)

npm run start:desktop:windows fails. The problem ppears to be wrong path in electron/main.desktop.ts:16, which is 'frameworks/electron/index' but in the new version should be 'shared/electron/index'.

• What is the new behavior (if this is a feature change)?

Builds and starts the electron app, although the app itself does not display. But the bug that prevented successful build is fixed.

• Other information: