Adjust quantum for default asset in market-sim integration tests

[cdummett]

Currently the default asset for market-sim integration tests has:

• decimal_places=5
• quantum=1

        vega.create_asset(
            MM_WALLET.name,
            name=ASSET_NAME,
            symbol=ASSET_NAME,
            decimals=5,
            max_faucet_amount=10 * mint_amount * 1e5,
        )

This makes it difficult to debug tests where quantum is involved, e.g. referral programs, volume discount programs, transfer fee discounts.

Proposed change:

• decimal_places=5
• quantum=100000

Tests will need fixing after change.