fix(mge/module): fix quantized fold weight value range limit for fused conv/bn modules

GitOrigin-RevId: 007c2f13b68575fcf63324f9e87e9d69bab83fc1

python_module/megengine/module/qat/conv_bn.py

@@ -62,6 +62,7 @@ class _ConvBnActivation2d(Float._ConvBnActivation2d, QATModule):
                 self.conv.groups, -1, 1, 1, 1
             )
 
+        w_fold = self.apply_quant_weight(w_fold)
         # b_fold = gamma * (b - bn_mean) / bn_std + beta
         b_fold = beta + gamma * (conv_bias - bn_mean) * bn_istd
         return w_fold, b_fold