JsonConf handles Unicode path/value wrong on Win32
<h3><details><summary>Original Reporter info from Mantis: <small>Alextp</small></summary><small> - **Reporter name:** CudaText man </small></details></h3> ## Description: I tested on last FPC trunk fpJson version.<br/> On each reading/writing a Unicode json path/value, I see corrupted enc in resulting json file. Demo app writes file t.json in its folder. Each button press makes file bad. ## Mantis conversion info: - **Mantis ID:** 35113 - **Platform:** Win10, Win7 x64 - **Version:** 3.3.1 - **Fixed in version:** 3.3.1 - **Fixed in revision:** 41473 (#970188907efc398777cbcefade890e37d61a4bed) - **Target version:** 3.2.0
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