update test case, appkey not exist error code is 1004

Author: KenChoi

src/test/java/cn/jpush/api/push/remote/ExceptionTest.java

@@ -30,7 +30,7 @@ public void appKeyNotExist() {
         } catch (APIConnectionException e) {
             e.printStackTrace();
         } catch (APIRequestException e) {
-            assertEquals(APPKEY_NOT_EXIST, e.getErrorCode());
+            assertEquals(AUTHENTICATION_FAIL, e.getErrorCode());
         }
     }