Preserve a format of RPC command definitions

Currently RPC commands are formatted in a way that it's easy to read
and that test/lint/check-rpc-mappings.py can parse it.

To void breaking test/lint/check-rpc-mappings.py script by running
clang-format, RPC command definitions should be disabled for clang-format.

src/wallet/rpcwallet.cpp

@@ -4760,6 +4760,7 @@ UniValue importprunedfunds(const JSONRPCRequest& request);
 UniValue removeprunedfunds(const JSONRPCRequest& request);
 UniValue importmulti(const JSONRPCRequest& request);
 
+// clang-format off
 static const CRPCCommand commands[] =
 { //  category              name                                actor (function)                argNames
     //  --------------------- ------------------------          -----------------------         ----------
@@ -4834,6 +4835,7 @@ static const CRPCCommand commands[] =
 
     { "generating",         "generate",                         &generate,                      {"nblocks","maxtries"} },
 };
+// clang-format on
 
 void RegisterWalletRPCCommands(CRPCTable &t)
 {