Fix caml_obj after review

Author: DZakh

jscomp/runtime/caml_obj.res

@@ -327,7 +327,7 @@ let rec equal = (a: Obj.t, b: Obj.t): bool =>
           let a: {..} = Obj.magic(a)
           let b: {..} = Obj.magic(b)
           if %raw(`b instanceof Error`) && a["message"] === b["message"] {
-            equal(a["clause"], b["clause"])
+            equal(a["cause"], b["cause"])
           } else {
             false
           }

lib/es6/caml_obj.js

@@ -320,8 +320,8 @@ function equal(_a, _b) {
     if (!((b instanceof Error) && a.message === b.message)) {
       return false;
     }
-    _b = b.clause;
-    _a = a.clause;
+    _b = b.cause;
+    _a = a.cause;
     continue;
   };
 }

lib/js/caml_obj.js

@@ -320,8 +320,8 @@ function equal(_a, _b) {
     if (!((b instanceof Error) && a.message === b.message)) {
       return false;
     }
-    _b = b.clause;
-    _a = a.clause;
+    _b = b.cause;
+    _a = a.cause;
     continue;
   };
 }