Add Test: submit_result with Winner::Player2 pays correct balances

[yahia008]

Priority: Medium
Estimated Time: 15 minutes

Description:
test_payout_winner only tests Winner::Player1. There is no test verifying that Winner::Player2 correctly transfers the full pot to player2 and leaves player1 with their post-deposit balance.

Tasks:

• Create match with stake_amount = 100, both players start with 1000
• Both players deposit
• Call submit_result with Winner::Player2
• Assert player2 balance is 1100 and player1 balance is 900

[ChukwuemekaP1]

@ChukwuemekaP1 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hey, I'd like to work on this.

I've written Soroban smart contracts in Rust and know that asymmetric test coverage on payout logic is a real gap — testing only Winner::Player1 leaves the Player2 path completely unverified, and a swap in the payout routing that sends the pot to the wrong address would pass CI undetected.

I'll add the test exactly as scoped: stake_amount = 100, both players start at 1000, both deposit, submit_result called with Winner::Player2, assert player2 at 1100 and player1 at 900. Clean and focused.

ETA: 12–24 hours from assignment. Can you assign this to me?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ChukwuemekaP1 to this issue.

[techisigu]

@techisigu has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I’m a smart contract developer who turns complex ideas into secure, production-ready blockchain code.
With strong skills in Rust and Solidity, I build systems that are fast, safe, and built to last.
My experience with the Stellar SDK lets me ship real-world Web3 solutions that actually move value

ℹ️ Repo Maintainers: To accept this application, review their application or assign @techisigu to this issue.