### 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
// Project should not be converted more than once.
	{
		String converter_text = "; Project was converted by built-in tool to Godot 4.0";
		ERR_FAIL_COND_V_MSG(!FileAccess::exists("project.godot"), ERROR_CODE, "Current working directory doesn't contain a \"project.godot\" file for a Godot 3 project.");
		Error err = OK;
		String project_godot_content = FileAccess::get_file_as_string("project.godot", &err);
		ERR_FAIL_COND_V_MSG(err != OK, ERROR_CODE, "Unable to read \"project.godot\".");
		ERR_FAIL_COND_V_MSG(project_godot_content.contains(converter_text), ERROR_CODE, "Project was already converted with this tool.");
		Ref<FileAccess> file = FileAccess::open("project.godot", FileAccess::WRITE);
		ERR_FAIL_COND_V_MSG(file.is_null(), ERROR_CODE, "Unable to open \"project.godot\".");
		file->store_string(converter_text + "\n" + project_godot_content);
	
	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;
		{
			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();
				lines.append(line);
			
		
		String file_content_before = collect_string_from_vector(lines);
		uint64_t hash_before = file_content_before.hash();
		uint64_t file_size = file_content_before.size();