Use correct entitlements and dsym files with custom config

[floorish]

make release would fail when using custom bundle id or XPC names in ConfigCommon.xcconfig

Fixes #2445

Misc Checklist

• [ ] My change requires a documentation update on Sparkle's website repository
• [ ] My change requires changes to generate_appcast, generate_keys, or sign_update

Testing

I tested and verified my change by using one or multiple of these methods:

• [ ] Sparkle Test App
• [ ] Unit Tests
• [ ] My own app
• [x] Other (please specify)

Running make release now succeeds when using a custom values in ConfigCommon.xcconfig.

Tested with:

INSTALLER_LAUNCHER_NAME = InstallerCustom
DOWNLOADER_NAME = DownloaderCustom
XPC_SERVICE_BUNDLE_ID_PREFIX = org.sparkle-project.custom

macOS version tested: 13.5.2 (22G91) Xcode 15