LatinIME: add config to set default value of gesture enabled

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

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<resources>

    <bool name="config_gesture_input_default_value">true</bool>

</resources>

        android:key="gesture_input"

        android:key="gesture_input"

        android:title="@string/gesture_input"

        android:title="@string/gesture_input"

        android:summary="@string/gesture_input_summary"

        android:summary="@string/gesture_input_summary"

        android:defaultValue="true"

        android:defaultValue="@bool/config_gesture_input_default_value"

        android:persistent="true" />

        android:persistent="true" />

    <CheckBoxPreference

    <CheckBoxPreference

        android:key="pref_gesture_floating_preview_text"

        android:key="pref_gesture_floating_preview_text"