Fix #1073: toJSON incorrectly wraps single table in array

[0xSenior]

Problem:

• toJSON({ key = value }) returned '[{...}]' instead of '{...}'
• WriteToJSONString() always called WriteToJSONArray(), wrapping all results in a JSON array even for single table arguments

Solution:

• Check if there is exactly one argument and it is a table (LUA_TTABLE)
• If so, serialize it directly using WriteToJSONObject() instead of wrapping it in an array via WriteToJSONArray()
• Otherwise, fall back to existing array behavior

Files changed:

• Client/mods/deathmatch/logic/lua/CLuaArguments.cpp
• Server/mods/deathmatch/logic/lua/CLuaArguments.cpp

This fix maintains backward compatibility for multiple arguments and non-table single arguments.

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