Fix spacing in imgui_imp_sdl example (#2111)

examples/imgui_impl_sdl.cpp

@@ -113,7 +113,7 @@ bool ImGui_ImplSDL2_ProcessEvent(SDL_Event* event)
     return false;
 }
 
-static bool    ImGui_ImplSDL2_Init(SDL_Window* window)
+static bool ImGui_ImplSDL2_Init(SDL_Window* window)
 {
     g_Window = window;