Init threat offsets at compile time

Init threat offsets at compile time. Avoid another global init function call.

Passed STC Non-Regression:
https://tests.stockfishchess.org/tests/view/694971a83c8768ca4507275c
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 43296 W: 11284 L: 11077 D: 20935
Ptnml(0-2): 152, 4611, 11924, 4800, 161

closes https://github.com/official-stockfish/Stockfish/pull/6487

No functional change

src/syzygy/tbprobe.cpp

@@ -35,6 +35,7 @@
 #include <type_traits>
 #include <utility>
 #include <vector>
+#include <array>
 
 #include "../bitboard.h"
 #include "../misc.h"