Expanding custom game sliders

[sadnixon]

Changes

This expands the allowed amount of Custom Game liberal policies to 10, and the amount of Custom Game fascist policies to 20

Screenshots

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Tested Locally

• [X] This PR has been tested locally, and ensured to not cause any breaking changes
• [ ] This PR makes a trivial change

Tests

• [ ] Automated tests have been added
• [X] This PR does not require tests

Changelog

• [ ] Changelog Section below has been updated with Changelog entry
• [ ] This PR does not make a user-facing change

Changelog Entry (delete this section if this PR does not need a changelog entry)

Check one, delete the other:

• [X] New Feature
• [ ] Bug Fix

Check one, delete the other:

• [ ] Major Change
• [X] Minor Change

Changelog Headline: Custom Game Deck Expansion!

Changelog Details: The allowed amount of liberal cards in Custom Games has been expanded to 10, and the allowed amount of fascist cards has been expanded to 20.

[Vigasaurus]

Can you rebase this onto next instead of master?