Use cosigner index 0 for read only wallets

[someone235]

Fixes a problem with read only wallets where the addresses it generates belong to cosigner index -1 and are not scanned by the other wallets

[codecov]

Codecov Report

Merging #2014 (acceb19) into dev (6725902) will increase coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #2014      +/-   ##
==========================================
+ Coverage   59.65%   59.72%   +0.06%     
==========================================
  Files         663      663              
  Lines       31558    31560       +2     
==========================================
+ Hits        18827    18849      +22     
+ Misses      10044    10030      -14     
+ Partials     2687     2681       -6     

Impacted Files	Coverage Δ
cmd/kaspawallet/create.go	0.00% <0.00%> (ø)
...k/netadapter/server/grpcserver/connection_loops.go	56.89% <0.00%> (-3.45%)	⬇️
infrastructure/network/netadapter/router/route.go	88.57% <0.00%> (+5.71%)	⬆️
...rver/grpcserver/protowire/rpc_get_mempool_entry.go	72.72% <0.00%> (+6.06%)	⬆️
infrastructure/network/rpcclient/rpcclient.go	69.66% <0.00%> (+6.74%)	⬆️
infrastructure/network/rpcclient/rpc_get_info.go	63.63% <0.00%> (+18.18%)	⬆️
...ructure/network/rpcclient/rpc_get_mempool_entry.go	63.63% <0.00%> (+18.18%)	⬆️
app/rpc/rpchandlers/get_mempool_entry.go	64.70% <0.00%> (+23.52%)	⬆️
...etadapter/server/grpcserver/protowire/rpc_error.go	100.00% <0.00%> (+25.00%)	⬆️
app/appmessage/error.go	27.27% <0.00%> (+27.27%)	⬆️

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