Non-primary device can create signatures

[TripleSpeeder]

A secondary device should always get the blind signatures from the primary device.
But when linking an app on a secondary device, there is a call to updateBlindSig which will create/update a blind signature:

BrightID/BrightID/src/components/Apps/model.ts

Line 178 in 95df1ab

await store.dispatch(updateBlindSig(appInfo));

[TripleSpeeder]

@abramsymons Is this a bug or am I missing something?