[Cashtab] Stop showing [object Object] on agora offers yet to populate token cache info

Summary:
We want to show an inline loader in this case. Current code is stringifying inline loaders inside a link.

Add a condition to show the loader instead of the stringified loader as link.

Test Plan:
npm test, see screenshot

before:

after:

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D17270