Fix capitalization error for Reduce brightness

    <string name="daltonizer_mode_tritanomaly_summary">Blue-yellow</string>

    <!-- Title for the accessibility preference and switch of the Reduce Brightness feature. [CHAR LIMIT=NONE] -->

    <string name="reduce_bright_colors_preference_title">Reduce Brightness</string>

    <string name="reduce_bright_colors_preference_title">Reduce brightness</string>

    <!-- Summary for the accessibility preference to configure Reduce Brightness feature. [CHAR LIMIT=NONE] -->

    <string name="reduce_bright_colors_preference_summary" product="default">Make screen darker than your phone\u2019s minimum brightness</string>

    <!-- Summary for the accessibility preference to configure Reduce Brightness feature. [CHAR LIMIT=NONE] -->