Fixed compiler error caused by missing include

This was part of a fixup in the original branch, but was missed
because the initial patch was committed to the wrong branch.

src/plugins/simulator/fsx/simconnect_datadefinition.cpp

@@ -4,7 +4,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "simconnect_datadefinition.h"
-#include "simconnect/SimConnect.h"
 
 namespace BlackSimPlugin
 {