Derive Debug for AccessError

[tnull]

Just a tiny change that makes error handling a little bit easier downstream.

[codecov-commenter]

Codecov Report

Merging #1709 (689ac25) into main (301efc8) will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1709      +/-   ##
==========================================
+ Coverage   90.92%   91.40%   +0.48%     
==========================================
  Files          86       86              
  Lines       46417    50928    +4511     
  Branches    46417    50928    +4511     
==========================================
+ Hits        42204    46553    +4349     
- Misses       4213     4375     +162     

Impacted Files	Coverage Δ
lightning/src/chain/mod.rs	68.18% <100.00%> (ø)
lightning/src/util/events.rs	36.49% <0.00%> (-3.01%)	⬇️
lightning/src/chain/onchaintx.rs	94.71% <0.00%> (-0.23%)	⬇️
lightning/src/ln/monitor_tests.rs	99.44% <0.00%> (-0.12%)	⬇️
lightning/src/ln/payment_tests.rs	98.82% <0.00%> (-0.08%)	⬇️
lightning/src/ln/functional_tests.rs	97.88% <0.00%> (+0.77%)	⬆️
lightning/src/ln/msgs.rs	87.34% <0.00%> (+1.10%)	⬆️
lightning/src/util/test_utils.rs	79.92% <0.00%> (+2.42%)	⬆️
lightning-net-tokio/src/lib.rs	80.11% <0.00%> (+2.74%)	⬆️
lightning/src/ln/functional_test_utils.rs	96.36% <0.00%> (+2.77%)	⬆️
... and 2 more

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