update submodule basic_materials

.gitmodules

@@ -233,9 +233,6 @@
 [submodule "mods/pipeworks"]
 	path = mods/pipeworks
 	url = https://gitlab.com/VanessaE/pipeworks
-[submodule "mods/basic_materials"]
-	path = mods/basic_materials
-	url = https://gitlab.com/VanessaE/basic_materials
 [submodule "mods/sea"]
 	path = mods/sea
 	url = https://git.tchncs.de/Illuna-Minetest/minetest-mod-sea
@@ -272,3 +269,6 @@
 [submodule "mods/moreblocks"]
 	path = mods/moreblocks
 	url = https://github.com/minetest-mods/moreblocks
+[submodule "mods/basic_materials"]
+	path = mods/basic_materials
+	url = https://gitlab.com/VanessaE/basic_materials

basic_materials @ 78a9b38f

-Subproject commit a5fdb721c925552b54954388571878adbaa3f298
+Subproject commit 78a9b38f556a42260de3095f259b1b69a57cdbad