Revert "Add subdirectories to source file collection logic in SConstruct up to 3 layers of depth"

This reverts commit 84c86b3.

Author: Ivorforce

SConstruct

@@ -38,11 +38,7 @@ Run the following command to download godot-cpp:
 env = SConscript("godot-cpp/SConstruct", {"env": env, "customs": customs})
 
 env.Append(CPPPATH=["src/"])
-
 sources = Glob("src/*.cpp")
-sources.extend(Glob("src/*/*.cpp"))
-sources.extend(Glob("src/*/*/*.cpp"))
-sources.extend(Glob("src/*/*/*/*.cpp"))
 
 if env["target"] in ["editor", "template_debug"]:
     try: