make serivce::Endpoint::EnsurePathToService have a default timeout as a named constant.

llarp/rpc/rpc_server.cpp

@@ -512,8 +512,7 @@ namespace llarp::rpc
                                   }
                                   onGoodResult(result.reason);
                                 });
-                          },
-                          2s);
+                          });
                     };
                     if (exit.has_value())
                     {

llarp/service/endpoint.hpp

@@ -323,10 +323,15 @@ namespace llarp
       // nullptr if the path was not made before the timeout
       using PathEnsureHook = std::function<void(Address, OutboundContext*)>;
 
+      static constexpr auto DefaultPathEnsureTimeout = 2s;
+
       /// return false if we have already called this function before for this
       /// address
       bool
-      EnsurePathToService(const Address remote, PathEnsureHook h, llarp_time_t timeoutMS);
+      EnsurePathToService(
+          const Address remote,
+          PathEnsureHook h,
+          llarp_time_t timeoutMS = DefaultPathEnsureTimeout);
 
       using SNodeEnsureHook = std::function<void(const RouterID, exit::BaseSession_ptr, ConvoTag)>;