incorrect team score/side when loading round backups after halftime from before half time

[JensForstmann]

steps to reproduce:

• halftime and side switch after 15th round (score e.g. Team A 10, Team B 5)
• play 16th round (score e.g. Team A 10, Team B 6)
• restore to beginning of 14th round (score e.g. Team A 10, Team B 4)

now after 15th round the score reported via webhook is Team A 5, Team B 10

cause: https://github.com/JensForstmann/tmt2/blob/5580a4423930d1ac83ee532e738f4a0857bf0f23/backend/src/matchMap.ts#L169 If this gets calculated it still thinks it's A10:B6 so it thinks teams are in switched state.

[JensForstmann]

Closing this because it's a minor issue without any side effects (fixes itself) and without any easy solution.