Remove an unused import

Follow up to I2b81450f99d7b4493ba0fc5e502f4333b8db48cd

Change-Id: I3d106db076e8181b65ce6843b801d12c6ca0adb1

java/src/com/android/inputmethod/keyboard/emoji/EmojiCategory.java

@@ -30,7 +30,6 @@ import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.KeyboardId;
 import com.android.inputmethod.keyboard.KeyboardLayoutSet;
 import com.android.inputmethod.latin.R;
-import com.android.inputmethod.latin.common.Constants;
 import com.android.inputmethod.latin.settings.Settings;
 
 import java.util.ArrayList;