### Godot version

Godot 4.0 Beta 11

### System information

Linux Ubunutu

### Issue description

Godot's 3.x project converter to 4.0 seems to be missing the conversion for two drag data related functions.

In 3.x the function for can drop data, was named  `can_drop_data` in 4.0 it is `_can_drop_data`.
And likewise 3.x had `drop_data` and 4.0 has `_drop_data`.

These two functions were not converted by the project converter (and were hard to notice)!


### Steps to reproduce

Convert a 3.x project to 4.0 with the functions: `can_drop_data` it will not convert to `_can_drop_data` nor `drop_data` to `_drop_data`.



### Minimal reproduction project

N/A
Vector<String> collected_files = check_for_files();
	uint32_t converted_files = 0;
	// Check file by file.
	for (int i = 0; i < collected_files.size(); i++) {
		String file_name = collected_files[i];
		Vector<String> lines;
		uint32_t ignored_lines = 0;
		uint64_t file_size = 0;
		{
			Ref<FileAccess> file = FileAccess::open(file_name, FileAccess::READ);
			ERR_CONTINUE_MSG(file.is_null(), vformat("Unable to read content of \"%s\".", file_name));
			while (!file->eof_reached()) {
				String line = file->get_line();
				file_size += line.size();
				lines.append(line);
			
		
		print_line(vformat("Checking for conversion - %d/%d file - \"%s\" with size - %d KB", i + 1, collected_files.size(), file_name.trim_prefix("res://"), file_size / 1024));
		Vector<String> changed_elements;
		Vector<String> reason;
		bool is_ignored = false;
		uint64_t start_time = Time::get_singleton()->get_ticks_msec();
		if (file_name.ends_with(".shader")) {
			reason.append("\tFile extension will be renamed from \"shader\" to \"gdshader\".");
		
		if (file_size < uint64_t(maximum_file_size)) {
			if (file_name.ends_with(".gd")) {
				changed_elements.append_array(check_for_rename_classes(lines, reg_container));
				changed_elements.append_array(check_for_rename_common(enum_renames, reg_container.enum_regexes, lines));