Remove an extra layer of wrapping for matchers/custom matchers

Helps reduce how nested custom matchers have to be for users as well as
Jasmine internal matchers

[#59161378]

src/core/matchers/toContain.js

@@ -2,13 +2,10 @@ getJasmineRequireObj().toContain = function() {
   function toContain(util, customEqualityTesters) {
     customEqualityTesters = customEqualityTesters || [];
 
-    return {
-      compare: function(actual, expected) {
-
-        return {
-          pass: util.contains(actual, expected, customEqualityTesters)
-        };
-      }
+    return function(actual, expected) {
+      return {
+        pass: util.contains(actual, expected, customEqualityTesters)
+      };
     };
   }