Unify input arguments between Terminal and Crypto API usage

[minhhoang1023]

In Crypto API, there are multiple places where users have to load exchange-specific ID (e.g. btc-bitcoin), instead of using the symbol (e.g. btc) as in the terminal. This fixes the issue, such that input arguments will be the same whether it's via the Terminal or using API.

Examples:

• From Crypto API: Load ticker btc-bitcoin

• From Terminal: Load ticker btc

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