removed io void conversion since imgui gui is in use later

this lines purpose was to make the warning go away that said imgui io is
not in use

SakuraVNE/src/Application.cpp

@@ -62,7 +62,6 @@ bool Application::Init() {
     ImGui::CreateContext();
 
     ImGuiIO &io = ImGui::GetIO();
-    (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
 
     ImGui::StyleColorsDark();