remove workaround for closure compiler that is now causing problems

was added in 5a60e543a5

javascript/olm_pre.js

@@ -14,7 +14,6 @@ if (typeof(window) !== 'undefined') {
         var bytes = nodeCrypto['randomBytes'](buf.length);
         buf.set(bytes);
     };
-    process = global["process"];
 } else {
     throw new Error("Cannot find global to attach library to");
 }