### 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 (int i = from; i < to; i++) {
		value += arguments[i];
		if (i != to - 1) {
			value += ',';
		
	
	return value;
// Returns the indentation (spaces and tabs) at the start of the line e.g. `\t\tmove_this` returns `\t\t`.
String rter3To4::get_starting_space(const String &line) const {
	String empty_space;
	int current_character = 0;
	if (line.is_empty()) {
		return empty_space;
	
	if (line[0] == ' ') {
		while (current_character < line.size()) {
			if (line[current_character] == ' ') {
				empty_space += ' ';
				current_character++;
			 
				break;
			
		
	
	if (line[0] == '\t') {
		while (current_character < line.size()) {
			if (line[current_character] == '\t') {
				empty_space += '\t';
				current_character++;