CountedMap isn't updating the count on set.

[ruseinov]

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Description of bug

Currently, when doing CountedMap::set it does not update the count, either on value removal or insertion. It should be consistent with StorageMap::set that simply delegates to either StorageMap::insert or StorageMap::remove.

We should make sure CountedMap::set delegates to CountedMap::insert or CountedMap::remove.

Steps to reproduce

Create a CountedMap, try to set a value and then check CountedMap::count() to verify that it returns 0.

[Polkadot-Forum]

This issue has been mentioned on Polkadot Forum. There might be relevant details there:

https://forum.polkadot.network/t/polkadot-release-analysis-v0-9-38/2122/1