Bumping version to 20504 for B release

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

    package="com.android.dialer"

    coreApp="true"

    android:versionCode="20503"

    android:versionName="2.05.03">

    android:versionCode="20504"

    android:versionName="2.05.04">

    <uses-sdk

        android:minSdkVersion="23"