Invalid rent exempt check for Solana SPL withdraws

[lumtis]

Describe the Bug

At the line x/crosschain/keeper/evm_hooks.go:333

We check cctx value so it's greater than the rent amount, we check this value if chain is Solana even we're using a SPL token and not SOL.

The value checked is 0.001SOL (1000000), this makes withdraws for some SPL not usable if decimal is too low. For example the minimum for BTC would be 0.01BTC.

We should determine if this check is still relevant, remove or update it.

[lumtis]

Closed by #3374

@ws4charlie please attach issues to PR