[Bug]: claimRewards() is always sending 0 DIP rewards and resets user's rewardsBalance when called before unstake()

[rapidddenis]

What happened?

Steps to reproduce:

1. Create fresh risk bundle and stake some USDT.
   https://mumbai.polygonscan.com/tx/0xe0535fb6ec7782dceb8a488675425b40a97901a5bbd7eeed23eb5f4c5b2f48c0
2. Stake some DIP into this bundle.
   https://mumbai.polygonscan.com/tx/0x036d950af16481c409ba7a3b168df5a3623d66ee072df4b9c7e9fd89dac721af
3. Wait while some DIP rewards are accumulated.
4. Claim rewards
   Expected behaviour: DIP transferred >= "Accumulated Rewards" value in staking UI
   Actual behaviour: DIP transferred = 0, "Accumulated Rewards" resets to 0.
   First claim:

https://mumbai.polygonscan.com/tx/0x3626d3b0f1c9aeba6f724259a9fbd9a8d69cfc9d91f869957f9164e86e765af3

Second claim:

https://mumbai.polygonscan.com/tx/0xff684a1b10c60e4e3ec3a9335598314b4e50cd186cc47973fb46b92e29f88402

5. Close risk bundle
   https://mumbai.polygonscan.com/tx/0x2160d9fc129a9f40f0b9ab94bd33e02c889873a440d8227c6cbdb2b4172f5d05

6. Unstake DIP without claiming rewards.
   https://mumbai.polygonscan.com/tx/0xd6633cce0acf2c401ea9fd14db999750dd307de9453c7575c69e313481ae4be6

7. Claim rewards. This time DIP transferred > 0 but value is smaller than first and second claims combined.
   https://mumbai.polygonscan.com/tx/0x0763820d43e80609555ea51643a5e1b5a80b7f5c235d8f1485e652a55651da67

What operating system are you seeing the problem on?

Mac OS

What browsers are you seeing the problem on?

Safari

What wallet extension are you using?

Metamask

Rules

• I agree to follow this project's rules

[rapidddenis]

Missing call to _updateRewards() during claimRewards(), thus info[].rewardBalance stays 0 and no DIP is transferred. While _decreaseRewards() updating info[].updatedAt to current block which resets rewards calculations

[susanneetherisc]

This is more than low but less than medium so 5,000 DIP will be rewarded