Fix missing closing brace in Monitor::ONVIF::start function

Added the missing closing brace for the else block (success path) that starts
at line 261. The function now compiles correctly with proper brace matching.

Co-authored-by: connortechnology <925519+connortechnology@users.noreply.github.com>

src/zm_monitor_onvif.cpp

@@ -315,6 +315,7 @@ void Monitor::ONVIF::start() {
       healthy = false;
     } // end renew
   }
+  } // end else (success block)
 #else
   Error("zmc not compiled with GSOAP. ONVIF support not built in!");
 #endif