Fix double help icon in wificalling screen

Change-Id: I36d4af83e1cb7fd77b360829baab2004422488c6
Fixes: 71538192
Test: robotests

tests/robotests/src/com/android/settings/wifi/calling/WifiCallingSettingsForSubTest.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi.calling;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class WifiCallingSettingsForSubTest {
+
+    @Test
+    public void getHelpResource_shouldReturn0() {
+        assertThat(new WifiCallingSettingsForSub().getHelpResource())
+                .isEqualTo(0);
+    }
+}