Functions selector name is not aligned with specs

On the selector specs, the methods hash should be padded with leading zeros, but on the current operation call in the explorer, we only show the hash without leading zeros.

Specs: https://docs.fuel.network/docs/specs/abi/fn-selector-encoding/#function-selector-encoding

Start by locating the explorer's current operation-call selector display and compare its output with the function selector encoding specification linked in the issue. The change is complete when the methods hash is shown with the required leading-zero padding, matching the specification and screenshot.

Written by the indexing model from the issue text.