Added a check for trailing dot when creating folder.

Merge the trailing dot test into existing test. Removed OS test.

editor/filesystem_dock.cpp

@@ -918,7 +918,7 @@ void FileSystemDock::_make_dir_confirm() {
 	if (dir_name.length() == 0) {
 		EditorNode::get_singleton()->show_warning(TTR("No name provided"));
 		return;
-	} else if (dir_name.find("/") != -1 || dir_name.find("\\") != -1 || dir_name.find(":") != -1) {
+	} else if (dir_name.find("/") != -1 || dir_name.find("\\") != -1 || dir_name.find(":") != -1 || dir_name.ends_with(".")) {
 		EditorNode::get_singleton()->show_warning(TTR("Provided name contains invalid characters"));
 		return;
 	}