fix: add missing MODEL_TENSOR.FFN_EXP_PROBS_B to MEGREZ_MOE constants

Author: tamarPal

gguf-py/gguf/constants.py

@@ -1568,6 +1568,7 @@ class MODEL_TENSOR(IntEnum):
         MODEL_TENSOR.FFN_GATE_EXP,
         MODEL_TENSOR.FFN_DOWN_EXP,
         MODEL_TENSOR.FFN_UP_EXP,
+        MODEL_TENSOR.FFN_EXP_PROBS_B,
         MODEL_TENSOR.FFN_GATE_INP_SHEXP,
         MODEL_TENSOR.FFN_GATE_SHEXP,
         MODEL_TENSOR.FFN_DOWN_SHEXP,