Use double pointer when passing rpcError to errors.As

[someone235]

No description provided.

[codecov]

Codecov Report

Merging #2039 (9b4024a) into dev (540b0d3) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #2039      +/-   ##
==========================================
- Coverage   59.49%   59.43%   -0.06%     
==========================================
  Files         675      675              
  Lines       32213    32213              
==========================================
- Hits        19166    19147      -19     
- Misses      10301    10315      +14     
- Partials     2746     2751       +5     

Impacted Files	Coverage Δ
app/rpc/rpchandlers/get_balance_by_address.go	0.00% <0.00%> (ø)
app/rpc/rpchandlers/get_balances_by_addresses.go	0.00% <0.00%> (ø)
app/appmessage/error.go	0.00% <0.00%> (-27.28%)	⬇️
...etadapter/server/grpcserver/protowire/rpc_error.go	75.00% <0.00%> (-25.00%)	⬇️
app/rpc/rpchandlers/get_mempool_entry.go	41.17% <0.00%> (-23.53%)	⬇️
...ructure/network/rpcclient/rpc_get_mempool_entry.go	45.45% <0.00%> (-18.19%)	⬇️
app/protocol/flows/v5/blockrelay/block_locator.go	52.94% <0.00%> (-11.77%)	⬇️
...rver/grpcserver/protowire/rpc_get_mempool_entry.go	66.66% <0.00%> (-6.07%)	⬇️
...ructure/network/rpcclient/grpcclient/grpcclient.go	76.56% <0.00%> (-4.69%)	⬇️
infrastructure/network/rpcclient/rpcclient.go	67.41% <0.00%> (-2.25%)	⬇️
... and 1 more

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