Fix missing comma in @_expose attribute for SwiftSyntax602 #2032

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 32s
BridgeJS Tests (swift:6.1.2, 601.0.1)	2m 32s
BridgeJS Tests (swift:6.2, 602.0.0)	2m 29s
format	29s
BridgeJS Tests (swift:6.0.3, 600.0.1)	2m 31s
check-bridgejs-generated	2m 41s
build-examples	43m 28s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 13s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 52s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 11s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 9s
deploy-examples	0s
	1h 53m 7s

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