fix: replace any `ttl-num-blocks` value

[kinrokinro]

Overview

On one of our node I found the default ttl-num-blocks value as 10 instead of 5, so the default approach will not work in this case and it should be fixed with this commit.

[coderabbitai[bot]]

📝 Walkthrough

## Walkthrough The changes in the pull request focus on the `Makefile`, specifically the `configure-v3` target. The modifications involve updating the sed commands to enhance the flexibility of the `ttl-num-blocks` configuration parameter. Instead of explicitly replacing the value `5` with `12`, the new command employs a more general pattern that matches any preceding value. This adjustment ensures consistent behavior across macOS and Linux environments. Additionally, a minor formatting update is included, which adds a newline at the end of the file. ## Changes | File | Change Summary | |---------------|--------------------------------------------------------------------------------| | Makefile | Updated sed commands in `configure-v3` to use a general pattern for `ttl-num-blocks`; added a newline at the end of the file. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant User participant Makefile participant ConfigFile User->>Makefile: Run configure-v3 Makefile->>ConfigFile: Update ttl-num-blocks using sed ConfigFile-->>Makefile: Return updated configuration Makefile-->>User: Configuration updated successfully ```

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[kinrokinro]

I also found ttl-num-blocks = 0 and ttl-num-blocks = 15 on our RPC nodes (these have been around since the mocha-2 genesis I guess so that's probably the reason)

[evan-forbes]

thanks @kinrokinro !!