ClimbHome: Change misleading Seed assignment to nil value This was "Seed = ClimbHome", but ClimbHome was a nil value. This code still worked as the engine interpreted the nil value as empty string. But it can be very misleading. This changeset makes the Seed assignment more explicit by assigning the empty string directly. The compability has been tested.

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Lua scripts for engine testing. These scripts are the same as other Lua scripts

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in Hedgewars, but you ought to call `EndLuaTest(TEST_SUCCESSFUL)` or

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`EndLuaTest(TEST_FAILED)` when the test is completed.