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.h

@@ -9,6 +9,7 @@
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
+#include <simconnect/SimConnect.h>
 #include <windows.h>
 
 namespace BlackSimPlugin