Remove unnessesary top level curly braces in the world builder file.

[MFraters]

I noticed that there is no reason to have the top level curly braces in the world builder input file. They make the file less readable. Although they are required by the boost json reader, we can place them manually just before the file is passed to the json reader.

This change invalidates all current world builder files, and requires them to be changed. Since there hasn't been a release yet, that is fine.

[coveralls]

Pull Request Test Coverage Report for Build 81

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 97.503%

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Totals
Change from base Build 80:	0.006%
Covered Lines:	1757
Relevant Lines:	1802

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💛 - Coveralls