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/rpc/mining.cpp

@@ -968,6 +968,7 @@ static UniValue estimaterawfee(const JSONRPCRequest& request)
     return result;
 }
 
+// clang-format off
 static const CRPCCommand commands[] =
 { //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------
@@ -986,6 +987,7 @@ static const CRPCCommand commands[] =
 
     { "hidden",             "estimaterawfee",         &estimaterawfee,         {"conf_target", "threshold"} },
 };
+// clang-format on
 
 void RegisterMiningRPCCommands(CRPCTable &t)
 {