Remove old unneeded input code brought back by merge.

Source/Urho3D/Input/Input.cpp

@@ -367,10 +367,6 @@ Input::Input(Context* context) :
 
 Input::~Input()
 {
-#ifdef __EMSCRIPTEN__
-    delete emscriptenInput_;
-    emscriptenInput_ = 0;
-#endif
     context_->ReleaseSDL();
 }