fix: Force loading the polyfills for setImmediate and clearImmediate (WEBAPP-5440)

[atomrc]

Ok, hold on to your socks, this is a tough one.

On the webapp side, we need (Dexie needs to be precise) both setImmediate and clearImmediate.
Dexies uses a polyfill to actually declare both of them if the browser doesn't have them.

So in the case of a browser setImmediate AND clearImmediate are not defined so Dexie's polyfill triggers and define both

In the case of the desktop app, we actually set ONLY setImmediate in the preload script (see https://github.com/wireapp/wire-desktop/blob/796ab90f104861697d0cd662b63b6c5836242d68/electron/renderer/static/webview-preload.js#L195).
Which means that when Dexie loads its polyfill, setImmediate is defined (but not clearImmediate) so the polyfill doesn't do anything and we end up in the bug we current have on the login page.

This fix, forces the webapp to load the polyfill for both setImmediate and clearImmediate (so Dexie's polyfill won't be loaded).

[atomrc]

This could be a fix in 3 steps:

• first step : force the polyfill on the webapp (so we can release fast) ;
• second step : remove the setImmediate polyfill on the wrapper side and see if nothing breaks ;
• if second step is successful, third step : remove the forced polyfill on the webapp side ;
• if second step is a failure, third step : add the clearImmediate polyfill on the wrapper side and remove the forced polyfill on the webapp side (setImmediate is undefined in the preload script when node-integration is false electron/electron#2984 (comment))