Add appID to fix Windows notification management

[codebykat]

Fix

Looks like we missed a step in setting up notifications for Windows. Right now Simplenote doesn't show up in the notifications manager on Windows, and if you opt-out you can't re-enable them.

Fixes #2482

On Windows 10, a shortcut to your app with an Application User Model ID must be installed to the Start Menu. This can be overkill during development, so adding node_modules\electron\dist\electron.exe to your Start Menu also does the trick. Navigate to the file in Explorer, right-click and 'Pin to Start Menu'. You will then need to add the line app.setAppUserModelId(process.execPath) to your main process to see notifications.

https://www.electronjs.org/docs/tutorial/notifications#windows

Related: electron/electron#10864 and electron/electron#24330

Test

1. After receiving at least one notification from Simplenote
2. On Windows, go to Settings>System>Notifications & actions
3. Verify that Simplenote appears under "Get notifications from these senders"
4. Toggle off sounds and verify that only the banner appears, with no sound

Release

Fixed a bug causing the app to be missing from Windows 10 notification settings.

[codebykat]

Oh hey, my second try actually worked!

[dmsnell]

looks great but would it benefit us to put it down at the end with the other app.on('ready', …) hook?

[codebykat]

HAHA okay

[codebykat]

I kept it as two function calls for symmetry's sake 31ff235