Remove unused fields instead of suppressing warnings

src/test/java/fr/xephi/authme/command/PlayerCommandTest.java

@@ -38,8 +38,6 @@ public class PlayerCommandTest {
         // given
         Player player = mock(Player.class);
         List<String> arguments = Arrays.asList("arg1", "testarg2");
-        @SuppressWarnings("unused")
-        CommandService service = mock(CommandService.class);
         PlayerCommandImpl command = new PlayerCommandImpl();
 
         // when

src/test/java/fr/xephi/authme/command/executable/authme/ReloadCommandTest.java

@@ -85,8 +85,6 @@ public class ReloadCommandTest {
     public void shouldHandleReloadError() {
         // given
         CommandSender sender = mock(CommandSender.class);
-        @SuppressWarnings("unused")
-        CommandService service = mock(CommandService.class);
         doThrow(IllegalStateException.class).when(initializer).performReloadOnServices();
         given(settings.getProperty(DatabaseSettings.BACKEND)).willReturn(DataSourceType.MYSQL);
         given(dataSource.getType()).willReturn(DataSourceType.MYSQL);
@@ -105,8 +103,6 @@ public class ReloadCommandTest {
     public void shouldIssueWarningForChangedDatasourceSetting() {
         // given
         CommandSender sender = mock(CommandSender.class);
-        @SuppressWarnings("unused")
-        CommandService service = mock(CommandService.class);
         given(settings.getProperty(DatabaseSettings.BACKEND)).willReturn(DataSourceType.MYSQL);
         given(dataSource.getType()).willReturn(DataSourceType.SQLITE);