Apply a few minor fixes found while addressing the fellows PR for weights. (#7098)
This PR addresses a few minor issues found while working on the polkadot-fellows PR [https://github.com/polkadot-fellows/runtimes/pull/522](https://github.com/polkadot-fellows/runtimes/pull/522): - Incorrect generic type for `InboundLaneData` in `check_message_lane_weights`. - Renaming leftovers: `assigner_on_demand` -> `on_demand`.
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