[Settings] Code refactor - remove unused import lines

Remove some unused import lines within source code based on
https://source.android.com/setup/contribute/code-style

Bug: 182867979
Test: build pass
Change-Id: I76dbcfa9e5b435b2838401dfee15b12f472d07d0

tests/unit/src/com/android/settings/network/MultiNetworkHeaderControllerTest.java

@@ -41,7 +41,6 @@ import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
-
 @RunWith(AndroidJUnit4.class)
 public class MultiNetworkHeaderControllerTest {
     private static final String KEY_HEADER = "multi_network_header";

tests/unit/src/com/android/settings/network/telephony/EuiccPreferenceControllerTest.java

@@ -38,7 +38,6 @@ import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
-
 @RunWith(AndroidJUnit4.class)
 public class EuiccPreferenceControllerTest {
     private static final int SUB_ID = 2;

tests/unit/src/com/android/settings/network/telephony/MobileDataPreferenceControllerTest.java

@@ -46,7 +46,6 @@ import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
-
 @RunWith(AndroidJUnit4.class)
 public class MobileDataPreferenceControllerTest {
     private static final int SUB_ID = 2;

tests/unit/src/com/android/settings/vpn2/AppSettingsTest.java

@@ -17,6 +17,7 @@
 package com.android.settings.vpn2;
 
 import static com.android.settings.vpn2.AppManagementFragment.appHasVpnPermission;
+
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.eq;
 import static org.mockito.Mockito.when;