statsd: fix -Wreorder-init-list

C++20 will require members in a designated initializer to be in order
unlike C99.

Bug: 139945549
Test: lunch flame-userdebug && mm
Change-Id: I8260ee03b0e6d98fdbe42ebf38bbc9f216303efe
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>