🩹 Fix ADVANCE_K + DISTINCT_E_FACTORS sanity check (MarlinFirmware#25007)

Author: marciot

Marlin/src/inc/SanityCheck.h

@@ -1353,7 +1353,7 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
 #if ENABLED(LIN_ADVANCE)
   #if DISTINCT_E > 1
     constexpr float lak[] = ADVANCE_K;
-    static_assert(COUNT(lak) < DISTINCT_E, "The ADVANCE_K array has too many elements (i.e., more than " STRINGIFY(DISTINCT_E) ").");
+    static_assert(COUNT(lak) <= DISTINCT_E, "The ADVANCE_K array has too many elements (i.e., more than " STRINGIFY(DISTINCT_E) ").");
     #define _LIN_ASSERT(N) static_assert(N >= COUNT(lak) || WITHIN(lak[N], 0, 10), "ADVANCE_K values must be from 0 to 10 (Changed in LIN_ADVANCE v1.5, Marlin 1.1.9).");
     REPEAT(DISTINCT_E, _LIN_ASSERT)
     #undef _LIN_ASSERT