message: [Trivial] Pre-release warning message fixed.
diff: @@ -4436,7 +4436,7 @@ string GetWarnings(string strFor)
  string strRPC;
  if (!CLIENT_VERSION_IS_RELEASE)
  - strStatusBar = _("This is a pre-release test build - use at your own risk - do not use for mining or merchant applications");
  + strStatusBar = _("This is a pre-release test build - use at your own risk - do not use for staking or merchant applications!");
  if (GetBoolArg("-testsafemode", false))
  strStatusBar = strRPC = "testsafemode enabled";
  