[TME] Memory leak in kart properties

[kimden]

Description

If you discover it's caused by kimden/stk-code, please make sure to ping me well. If you discover it's related to 2.x upstream, please submit an issue to them, regardless of how soon it's going to be fixed.

Related to #30 too

[error  ] LeackCheck: leaks detected!!
[error  ] LeackCheck: 

* * * * WARNING * * * * WARNING * * * * MEMORY LEAK! * * * *
[error  ] LeackCheck: 9 watched objects leaking.
[error  ] LeakCheck: Undeleted object at /tyre/src/karts/kart_properties.hpp : 563
    (No stack information available)
<...>

Steps to reproduce

Exit the game. Use the Debug build

Configuration

latest git 0a1401d

Error message

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Log File (stdout.log)

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Input Configuration (input.xml)

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