[explorer] Missing mosaics for multisig-transaction

[cryptoBeliever]

Current Behavior

When a multisig transaction includes multiple mosaics, the explorer displays it as if it only involves a single mosaic.
For example:

• Explorer view
• Transaction Data

This transaction contains two mosaics:

• 9.000000 nem:xem
• 1.000000 w111:mosaic

However, the explorer displays only one mosaic:

By contrast, a similar non-multisig transaction correctly displays all mosaics:

• Explorer view
• Transaction Data

Expected Behavior

The explorer should correctly display all mosaics included in a multisig transaction, just as it does for non-multisig transactions.