Fix graphite2 intermediate output path

[johnml1135]

Summary

Fix the native graphite2 intermediate output base path in Build/Windows.targets by adding the missing path separator after $(fwrt).

Problem

NativeIntDirBase was defined as $(fwrt)Obj\$(config-capital)\, which expands to a sibling folder such as FieldWorksObj\Debug\graphite2 instead of the intended repo-local path FieldWorks\Obj\Debug\graphite2.

This only affected graphite2 because it is the only consumer of NativeIntDirBase.

Why this matters

Writing graphite2 intermediates outside the repository Obj tree can leave stale graphite outputs behind:

• repo cleanup and intermediate-output conventions expect native intermediates under FieldWorks\Obj
• graphite2 artifacts in the sibling FieldWorksObj folder are easy to miss during normal cleanup
• stale intermediates can be reused across rebuilds or configuration switches and make graphite behavior harder to reason about

Change

Update NativeIntDirBase to use:

$(fwrt)\Obj\$(config-capital)\

Validation

• ./build.ps1
• CI: Commit messages
• CI: Whitespace check

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This change is 

[Copilot]

Pull request overview

Fixes the native graphite2 intermediate output base path so native intermediates land under the repo-local Obj tree rather than a sibling directory.

Changes:

• Add the missing path separator after $(fwrt) in NativeIntDirBase to correctly point under $(fwrt)\Obj\...

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   6m 12s ⏱️ -1s
4 074 tests ±0  4 003 ✅ ±0  71 💤 ±0  0 ❌ ±0 
4 083 runs  ±0  4 012 ✅ ±0  71 💤 ±0  0 ❌ ±0 

Results for commit 8c7ac8d. ± Comparison against base commit 2565ac1.

[jasonleenaylor]

@jasonleenaylor reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on johnml1135).