Code Quality: Only include specific 7z.dll for each package architecture

[Pinguin2001]

Description

Files bundles by default all three 7z dlls regardless of the architecture.

Concerned code

src\Files.App\Files.App.csproj

Gains

To be fair, only 3 mbs reduction in bundle size, but it doesn't hurt

Requirements

Add three platform conditions

Comments

No response

[yaira2]

For future reference #16584 (comment)