codacy: organize imports

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

@@ -36,7 +36,6 @@ import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
-import android.os.Environment;
 import android.preference.ListPreference;
 import android.preference.Preference;
 import android.preference.Preference.OnPreferenceChangeListener;