Add shadow to "Don't suggest app" drop target

<?xml version="1.0" encoding="utf-8"?>

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<com.android.launcher3.graphics.ShadowDrawable

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:src="@drawable/ic_block_no_shadow"

    android:elevation="@dimen/drop_target_shadow_elevation" />

    <drawable name="ic_setup_shadow">@drawable/ic_setting</drawable>

    <drawable name="ic_remove_shadow">@drawable/ic_remove_no_shadow</drawable>

    <drawable name="ic_uninstall_shadow">@drawable/ic_uninstall_no_shadow</drawable>

    <drawable name="ic_block_shadow">@drawable/ic_block_no_shadow</drawable>

</resources>

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            updateText(R.string.uninstall_drop_target_label);

        } else if (action == DISMISS_PREDICTION) {

            mHoverColor = Themes.getColorAccent(getContext());

            setDrawable(R.drawable.ic_block);

            setDrawable(R.drawable.ic_block_shadow);

            updateText(R.string.dismiss_prediction_label);

        } else if (action == RECONFIGURE) {

            mHoverColor = Themes.getColorAccent(getContext());