Fix 6.0 build by removing trailing comma

Author: kateinoigakukun

Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift

@@ -395,7 +395,7 @@ struct BridgeJSLink {
 
         func renderFunction(
             name: String,
-            returnExpr: String?,
+            returnExpr: String?
         ) -> [String] {
             var funcLines: [String] = []
             funcLines.append(