删除了.cpp中的pragma once

[haytham818]

我也不知道为什么编辑器把\t 换成空格了

[Copilot]

Pull request overview

This pull request removes incorrect usage of #pragma once from C++ implementation files (.cpp). The #pragma once directive is a header guard that should only be used in header files (.h) to prevent multiple inclusion, not in implementation files.

Changes:

• Removed #pragma once from three .cpp files where it was incorrectly placed
• Reformatted LinuxPlatformUtils.cpp to use consistent whitespace (spaces instead of tabs)
• Reordered includes in LinuxPlatformUtils.cpp to maintain consistency

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Engine/src/Platform/Windows/WindowsPlatformUtils.cpp	Removed incorrect #pragma once directive
Engine/src/Himii/Renderer/Renderer2D.cpp	Removed incorrect #pragma once directive
Engine/src/Himii/Renderer/Buffer.cpp	Removed incorrect #pragma once directive
Engine/src/Platform/Linux/LinuxPlatformUtils.cpp	Reformatted with consistent spacing and brace placement

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