[Server] Include handleInput.cpp correctly

apps/openmw-mp/Networking.cpp

@@ -25,7 +25,7 @@
 #include "processors/ObjectProcessor.hpp"
 #include "processors/WorldstateProcessor.hpp"
 
-#include "handleInput.hpp"
+#include "handleInput.cpp"
 
 using namespace mwmp;
 using namespace std;

apps/openmw-mp/handleInput.hpp

@@ -1,3 +0,0 @@
-namespace mwmp_input {
-    void handler();
-}