## Description
### Issue
Some values (like chain ID) were being leaked from the previous block/initialization into PrepareProposal and ProcessProposal, these values are only available if:
1. The node has never been stopped since the genesis block (as these values are set on `InitChain`)
2. The node has already commited a block (as the previous header was being used for the new state of prepare and process proposal).
So if a node is restarted, during the first prepare and process proposal these values won't be populated, and that will cause issues if they are being used.
### Solution
Remove any previous header information from a previous block in the prepare and process proposal contexts, making things consistent at every height.
- Added ChainID to baseapp
- Use an empty header in Commit() with only the chain id set
- Fix context for prepare and process proposal
Closes: #15269
---
### Author Checklist
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- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
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- [ ] added a changelog entry to `CHANGELOG.md`
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### Reviewers Checklist
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I have...
- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
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- [ ] manually tested (if applicable)
Bumps [cosmossdk.io/api](https://github.com/cosmos/cosmos-sdk) from 0.3.0 to 0.3.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/cosmos/cosmos-sdk/blob/v0.3.1/CHANGELOG.md">cosmossdk.io/api's changelog</a>.</em></p>
<blockquote>
<h2>0.3.1 (March 23, 2017)</h2>
<p>IMPROVEMENTS:</p>
<ul>
<li>CLI returns exit code 1 and logs error before exiting</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/cosmos/cosmos-sdk/compare/v0.3.0...v0.3.1">compare view</a></li>
</ul>
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