fix(regression): model rendering for Swagger 2.0 body parameters (#4424)

* Fix model rendering for parameters

* tests(e2e): add test confirming that Pet model is shown in operation

src/core/components/parameter-row.jsx

@@ -197,7 +197,7 @@ export default class ParameterRow extends Component {
                                                 getConfigs={ getConfigs }
                                                 isExecute={ isExecute }
                                                 specSelectors={ specSelectors }
-                                                schema={ schema }
+                                                schema={ param.get("schema") }
                                                 example={ bodyParam }/>
               : null
           }

test/e2e/scenarios/operations/pet.js

@@ -71,6 +71,16 @@ describe("render pet api container", function () {
         client.end()
     })
 
+    it("Testing post /pet api model values", function (client) {
+        apiWrapper.waitForElementVisible("@petOperationPostContainer", 5000)
+            .click("@petOperationPostCollpase")
+            .waitForElementVisible("@petOperationPostCollapseContainer", 5000)
+            .click("a.tablinks[data-name=model]")
+            .assert.containsText("span.model-title > .model-title__text", `Pet`)
+
+        client.end()
+    })
+
     it("render put /pet api container", function (client) {
         apiWrapper.waitForElementVisible("@petOperationPutContainer", 5000)
             .assert.containsText("@petOperationPutTitle", "/pet")