Use EnsureCapacity for string buffer#1
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GetStringTrackedDevicePropertyに使用するStringBuilderは、
LengthではなくEnsureCapacityでバッファ領域を確保しないと、不正なメモリ領域を参照する場合がある。
(タイミングが良いと成功してしまう)
具体的には
が正しくない答えを返す場合があったため修正