idb plainmessage gasprices

[turbocrime]

cc @TalDerei

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[TalDerei]

@turbocrime bumped idb version to enable gas fees on web. no changes need to be made to initGasPrices

when penumbra-zone/penumbra#4306 is merged, the gas prices will be enabled on testnet and the pb message in a single incoming compact block will not be undefined, and saveGasPrices will be called.

[TalDerei]

For context and visibility, the flow is:

1. Bump IDB version, clearing the database on upgrade,
2. Manually set default gas prices on indexDB initialization,
3. initGasPrices will only be called once on initialization, and condition will fail on subsequent extension startups,
4. Once non-zero gas fees are enabled in core, a single compact block's pb message will have a gasPrices field that won't be undefined,
5. In the block processor, it will call saveGasPrices and override the default value in indexDB,
6. remove the initGasPrices call