rpc: update cli for estimatefee argument rename

The first argument of estimatesmartfee was renamed from nblocks to
conf_target in 06bcdb8da6. Update the
client-side table as well.

src/rpc/client.cpp

@@ -116,7 +116,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "getrawmempool", 0, "verbose" },
     { "estimatefee", 0, "nblocks" },
     { "estimatesmartfee", 0, "nblocks" },
-    { "estimaterawfee", 0, "nblocks" },
+    { "estimaterawfee", 0, "conf_target" },
     { "estimaterawfee", 1, "threshold" },
     { "prioritisetransaction", 1, "dummy" },
     { "prioritisetransaction", 2, "fee_delta" },