LatinIME: Drop custom v21 theme

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

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** Copyright 2014, The Android Open Source Project

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** Licensed under the Apache License, Version 2.0 (the "License");

** you may not use this file except in compliance with the License.

** You may obtain a copy of the License at

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**     http://www.apache.org/licenses/LICENSE-2.0

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-->

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

    <style name="platformActivityTheme" parent="@android:style/Theme.DeviceDefault.Light" />

    <style name="platformSettingsTheme" parent="@android:style/Theme.DeviceDefault.Settings" />

    <style name="platformDialogTheme" parent="@android:style/Theme.DeviceDefault.Light.Dialog" />

</resources>