RFR: 8243562: Make display of search results consistent with color scheme

[Hannes Wallnoefer]

Please review a simple change to make the highlight color for javadoc search results fit in with the javadoc color scheme.

JBS: https://bugs.openjdk.java.net/browse/JDK-8243562
Webrev: http://cr.openjdk.java.net/~hannesw/8243562/webrev.00/
API (index page only): http://cr.openjdk.java.net/~hannesw/8243562/api.00/

Thanks,
Hannes