targets/wasm: update wasm_exec.js for go 1.13

This fixes the wasm examples for go 1.13, but breaks them for older go versions.

targets/wasm_exec.js

@@ -332,7 +332,6 @@
 				true,
 				false,
 				global,
-				this._inst.exports.memory,
 				this,
 			];
 			this._refs = new Map();