Revert "Fix localise_path method so that uncached scripts don't sometimes get loaded with two backslashes"

This reverts commit 1342551664091c1ceb931ee45d9c43f09df5f1ff.

core/project_settings.cpp

@@ -107,7 +107,7 @@ String ProjectSettings::localize_path(const String &p_path) const {
 		if (plocal == "") {
 			return "";
 		};
-		return plocal + path.substr((sep + 1), path.size() - (sep + 1));
+		return plocal + path.substr(sep, path.size() - sep);
 	};
 }