Fix crypto load

[jose-donato]

Description

Addresses #1701

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[piiq]

not there yet?

[minhhoang1023]

Now we are able to load crypto coins via symbol, instead of coin-id specific to each data source.

However, crypto load at the moment is still very buggy, and relies on a complicated, and hard-to-maintain crypto map between multiple data sources. I have been discussing with @jose-donato and we should refactor the code. This PR is a quick fix, so that users can load symbol in the mean time