Use icons/icon-game for all hardcoded logo needs

src/game_config.cpp

@@ -113,7 +113,7 @@ namespace game_config
 			ellipsis,
 			missing,
 			// notifications icon
-			app_icon = "images/game-icon.png";
+			app_icon = "images/icons/icon-game.png";
 	} //images
 
 	std::string shroud_prefix, fog_prefix;

src/game_launcher.cpp

@@ -395,7 +395,7 @@ bool game_launcher::init_video()
 #endif
 
 #if !(defined(__APPLE__))
-	surface icon(image::get_image("game-icon.png", image::UNSCALED));
+	surface icon(image::get_image("icons/icon-game.png", image::UNSCALED));
 	if(icon != NULL) {
 		///must be called after SDL_Init() and before setting video mode
 #if !SDL_VERSION_ATLEAST(2, 0, 0)