Proper fixes for `/dex` page

[joeldavidw]

What would you like to be added:

Quick fixes were made in https://github.com/DeFiCh/scan/pull/1316 & #1318.

Proper Fix for the following are needed:

• Filter for splitted pairs (e.g. amzn-dusd/v1)
• Usage of poolpairs displaySymbol instead of tokenA.displaySymbol for pairs where tokenA is used across multiple pairs (dUSDT-DUSD and dUSDT_DFI).

Why is this needed:

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[joeldavidw]

May want to consider using full poolpair displaySymbol from now on. To prevent links from breaking in the future.

cc: @gjj

[gjj]

You mean like the /v1 in:

• https://defiscan.live/tokens/dGOOGL/v1
• https://defiscan.live/tokens/dGOOGL-dDUSD/v1
• https://defiscan.live/tokens/dAMZN/v1
• ...and all other v1 stock split symbols?