Fixes in ddrnet_39.py

[ucLh]

There are calls to some non-existent network blocks in ddrnet_39.py. More specifically:

• Bottleneck_last in line 58
• SPP_super in line 271

Judging by the ddrnet_23_slim.py that has no such errors, I swapped Bottleneck_last to Bottleneck and SPP_super to DAPPM