fix: server: initialize the m_protocol member with a default value
    
    It is likely random whether the server works or not without
    a manually configured protocol option, which is neither documented
    nor enforced to be set.
    With a random uninitialized value in m_protocol, this can happen:
    [2025-08-03T12:39:57] NOTE: accepted client connection
    [2025-08-03T12:39:57] FATAL: a runtime error occurred: XInvalidProtocol
    
    Reports of "it works with debug enabled" are likely due to having
    parts of the memory space the server object is allocated into being
    cleared, and thus having a 0 (Synergy) startup value.
    
    This patch had been modified to apply against 1.23.0
--- a/src/lib/server/Server.h
+++ b/src/lib/server/Server.h
@@ -358,7 +358,7 @@ private:
   };
 
   // used in hello message sent to the client
-  ENetworkProtocol m_protocol;
+  ENetworkProtocol m_protocol = ENetworkProtocol::kSynergy;
 
   // the primary screen client
   PrimaryClient *m_primaryClient;