### 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
return clean_parts;
// Finds latest parenthesis owned by function.
// `function(abc(a,b),DD)):` finds this parenthess `function(abc(a,b),DD => ) <= ):`
int rter3To4::get_end_parenthesis(const String &line) const {
	int current_state = 0;
	for (int current_index = 0; line.length() > current_index; current_index++) {
		char32_t character = line.get(current_index);
		if (character == '(') {
			current_state++;
		
		if (character == ')') {
			current_state--;
			if (current_state == 0) {
				return current_index;
			
		
	
	return -1;
// Merges multiple arguments into a single String.
// Needed when after processing e.g. 2 arguments, later arguments are not changed in any way.
String rter3To4::connect_arguments(const Vector<String> &arguments, int from, int to) const {
	if (to == -1) {
		to = arguments.size();
	
	String value;
	if (arguments.size() > 0 && from != 0 && from < to) {
		value = ",";