BridgeJS: Fix `@JSClass` on public/package access level struct #2322

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 56s
format	32s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 6s
build-examples	18m 28s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 5s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 6s
Build for native target (macos-15, Xcode_16.4)	3m 12s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 59s
check-bridgejs-generated	2m 45s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	12m 31s
deploy-examples	0s
	1h 26m 40s

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