[minetest_game] Upgrade minetest game submodule to branch backport-0.4

.gitmodules

@@ -120,10 +120,6 @@
 [submodule "mods/stacktraceplus"]
 	path = mods/stacktraceplus
 	url = https://github.com/MinetestForFun/stacktraceplus.git
-[submodule "minetestforfun_game"]
-	path = minetestforfun_game
-	url = https://github.com/sys4-fr/minetest_game.git
-	branch = nalc
 [submodule "mods/cherry_tree"]
 	path = mods/cherry_tree
 	url = https://github.com/sys4-fr/cherry_tree.git
@@ -150,3 +146,7 @@
 [submodule "mods/item_drop"]
 	path = mods/item_drop
 	url = https://github.com/tacotexmex/item_drop.git
+[submodule "minetest_game"]
+	path = minetest_game
+	url = https://github.com/minetest/minetest_game.git
+	branch = backport-0.4

other_things/scripts/Server-side/script/start-mff.sh

@@ -18,7 +18,7 @@ while true
 	/home/vincent/jeux/mff/bin/minetestserver \
 		--world /home/vincent/jeux/mff/worlds/minetestforfun/ \
 		--config /home/vincent/jeux/mff/minetest.conf \
-		--gameid minetestforfun_game \
+		--gameid minetest_game \
 		--port 30002 \
 #		--logfile $DEBUG
 

worlds/minetestforfun/world.mt

@@ -1,4 +1,4 @@
-gameid = minetestforfun_game
+gameid = minetest_game
 backend = redis
 redis_hash = mff_sys4
 redis_address = localhost