Fix typo in string.

    <string name="permission_usage_list_title_last_hour">Most recent access in the last hour</string>

    <!-- Label for the title of the list of permission usages that shows which apps used which permissions[CHAR LIMIT=50] -->

    <string name="permission_usage_list_title_last_15_minutes">A=Most recent access in last 15 minutes</string>

    <string name="permission_usage_list_title_last_15_minutes">Most recent access in last 15 minutes</string>

    <!-- Label for the title of the list of permission usages that shows which apps used which permissions[CHAR LIMIT=50] -->

    <string name="permission_usage_list_title_last_minute">Most recent access in last 1 minute</string>