codacy: avoid unused imports

src/main/java/com/owncloud/android/ui/activity/NotificationsActivity.java

@@ -31,7 +31,6 @@ import android.os.Bundle;
 import android.support.design.widget.BottomNavigationView;
 import android.support.design.widget.Snackbar;
 import android.support.v4.widget.SwipeRefreshLayout;
-import android.support.v7.widget.DividerItemDecoration;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.MenuItem;

src/main/java/com/owncloud/android/ui/activity/UserInfoActivity.java

@@ -42,7 +42,6 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.StringRes;
 import android.support.v4.graphics.drawable.DrawableCompat;
-import android.support.v7.widget.DividerItemDecoration;
 import android.support.v7.widget.RecyclerView;
 import android.text.TextUtils;
 import android.view.LayoutInflater;