Update .gitignore (#2919)

.gitignore

 .DS_Store
 
-/deck/
-/expansions/
-/fonts/
+/deck
+/expansions
+/fonts
 /icon
-/pack/
-/pics/
-/replay/
-/single/
-/sound/
+/pack
+/pics
+/replay
+/single
+/sound
 !/sound/files.txt
-/WindBot/
+/WindBot
 /cards.cdb
 /error.log
 /bot.conf
@@ -25,16 +25,16 @@
 
 /.vscode/
 /bin/
-/build/
+/build
 /obj/
-/event/
-/freetype/
-/irrlicht/
-/irrklang/
-/ikpmp3/
-/lua/
-/miniaudio/
-/sqlite3/
+/event
+/freetype
+/irrlicht
+/irrklang
+/ikpmp3
+/lua
+/miniaudio
+/sqlite3
 /gframe/*.ico
 /gframe/ygopro.rc
 /gframe/ygopro.aps