Don't encode addresses as checksums with web3

[palango]

This isn't necessary since ethereum/web3.py#893

[codecov]

Codecov Report

Merging #5700 into develop will decrease coverage by 0.35%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #5700      +/-   ##
===========================================
- Coverage    79.58%   79.22%   -0.36%     
===========================================
  Files          131      131              
  Lines        15139    15139              
  Branches      2313     2313              
===========================================
- Hits         12048    11994      -54     
- Misses        2441     2480      +39     
- Partials       650      665      +15

Flag	Coverage Δ
#integration	62.52% <100%> (-11.07%)	⬇️
#unit	55.71% <0%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
raiden/network/proxies/token_network.py	44.29% <ø> (-3.85%)	⬇️
raiden/network/proxies/token.py	56.86% <100%> (ø)	⬆️
raiden/network/proxies/user_deposit.py	43.61% <100%> (+1.06%)	⬆️
raiden/network/proxies/token_network_registry.py	48.85% <100%> (-1.15%)	⬇️
raiden/utils/echo_node.py	68.9% <0%> (+1.68%)	⬆️
raiden/network/resolver/client.py	77.08% <0%> (ø)	⬆️
raiden/connection_manager.py	73.17% <0%> (ø)	⬆️
raiden/blockchain/state.py	94.33% <0%> (+1.88%)	⬆️
raiden/blockchain/decode.py	98.52% <0%> (ø)	⬆️
raiden/messages/encode.py	95% <0%> (ø)	⬆️
... and 41 more

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[rakanalh]

LGTM