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/main.cpp

@@ -21,7 +21,6 @@
 
 #include "bitboard.h"
 #include "misc.h"
-#include "nnue/features/full_threats.h"
 #include "position.h"
 #include "tune.h"
 #include "uci.h"
@@ -33,7 +32,6 @@ int main(int argc, char* argv[]) {
 
     Bitboards::init();
     Position::init();
-    Eval::NNUE::Features::init_threat_offsets();
 
     auto uci = std::make_unique<UCIEngine>(argc, argv);