[Wasm] Fix running wasm in the browser

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/compiler.kt

@@ -150,7 +150,7 @@ fun generateJsWasmLoader(kind: WasmLoaderKind, wasmFilePath: String, externalJs:
 
         WasmLoaderKind.BROWSER ->
             """
-                const { wasmInstance } = await WebAssembly.instantiateStreaming(fetch("$wasmFilePath"), { js_code });
+                const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(fetch("$wasmFilePath"), { js_code });
             """.trimIndent()
     }
 
@@ -189,4 +189,4 @@ fun writeCompilationResult(
     File(dir, "$fileNameBase.wasm").writeBytes(result.wasm)
     val jsWithLoader = generateJsWasmLoader(loaderKind, "./$fileNameBase.wasm", result.js)
     File(dir, "$fileNameBase.js").writeText(jsWithLoader)
-}
+}