fix padding not defined in cifar10 models

Author: Coderx7

cifar/models/simplenet.py

@@ -297,6 +297,7 @@ def _make_layers(self, scale: float):
             # check to convert any possible integer value to its decimal counterpart.
             custom_dropout = None if custom_dropout is None else float(custom_dropout)
             kernel_size = 3
+            padding = 1
             if layer_type == ['k1']:
                 kernel_size = 1
                 padding = 0