fix: always use modelMapping in channel test

controller/channel-test.go

@@ -58,7 +58,8 @@ func testChannel(channel *model.Channel, testModel string) (err error, openAIErr
 				testModel = "gpt-3.5-turbo"
 			}
 		}
-	} else {
+	}
+
 	modelMapping := *channel.ModelMapping
 	if modelMapping != "" && modelMapping != "{}" {
 		modelMap := make(map[string]string)
@@ -70,7 +71,6 @@ func testChannel(channel *model.Channel, testModel string) (err error, openAIErr
 			testModel = modelMap[testModel]
 		}
 	}
-	}
 
 	c.Request.Header.Set("Authorization", "Bearer "+channel.Key)
 	c.Request.Header.Set("Content-Type", "application/json")