Avoid unnecessary operation in PageAllocator.

There's no need to call `alignForward` before `VirtualAlloc`.
From [MSDN](https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc):
```
If the lpAddress parameter is NULL, this value is rounded up to the next page boundary
```
e57c9c0931Lucas Santos committed on 5/22/2024, 2:03:25 PM· committed by Andrew Kelleyparentd371823
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