[Game] Fix RoomPreview params

[gok99]

Description

Wraps game params that are passed into js-slang context for the game module.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

How to test

Under Go to My Room in source academy game with default room code, a gif of a mummy walking with the words Welcome to Source Academy! should appear

Checklist

• I have tested this code

[coveralls]

Pull Request Test Coverage Report for Build 942281933

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 30.233%

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Totals
Change from base Build 942236889:	0.0%
Covered Lines:	3230
Relevant Lines:	9864

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💛 - Coveralls