### 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
for (String &line : lines) {
				if (uint64_t(line.length()) > maximum_line_length) {
					ignored_lines += 1;
				
			
		 
			reason.append(vformat("    ERROR: File has exceeded the maximum size alwed - %d KB", maximum_file_size / 1024));
			is_ignored = true;
		
		uint64_t end_time = Time::get_singleton()->get_ticks_msec();
		if (is_ignored) {
			String end_message = vformat("    Checking file took %d ms.", end_time - start_time);
			print_line(end_message);
		 
			String file_content_after = collect_string_from_vector(lines);
			uint64_t hash_after = file_content_after.hash64();
			// Don't need to save file without any changes.
			// Save if this is a shader, because it was renamed.
			if (hash_before != hash_after || file_name.ends_with(".gdshader")) {
				converted_files++;
				Ref<FileAccess> file = FileAccess::open(file_name, FileAccess::WRITE);
				ERR_CONTINUE_MSG(file.is_null(), vformat("Unable to apply changes to \"%s\", no writing access.", file_name));
				file->store_string(file_content_after);
				reason.append(vformat("    File was changed, conversion took %d ms.", end_time - start_time));
			 
				reason.append(vformat("    File was left unchanged, checking took %d ms.", end_time - start_time));
			
			if (ignored_lines != 0) {
				reason.append(vformat("    Ignored %d lines, because their length exceeds maximum alwed characters - %d.", ignored_lines, maximum_line_length));