RFR (XS): 8139583: Fix formatting in survRateGroup.cpp

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that fixes some formatting in
survRateGroup.cpp.

This is a split-out of JDK-8137082, and so is based on these changes.

CR:
https://bugs.openjdk.java.net/browse/JDK-8139583
Webrev:
http://cr.openjdk.java.net/~tschatzl/8139583/webrev/
Testing:
jprt

Thanks,
  Thomas