### 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
if (chr == '\t' || chr == ' ') {
				continue;
			 else if (chr == '=') {
				foundNextEqual = true;
			 
				break;
			
		
		if (foundNextEqual) {
			line = line.substr(0, start) + ".button_pressed" + line.substr(start + String(".pressed").length());
		
	
	// rotating = true  ->   ignore_rotation = false # reversed "rotating" for Camera2D
	tains("rotating")) {
		int start = line.find("rotating");
		bool foundNextEqual = false;
		String line_to_check = line.substr(start + String("rotating").length());
		String assigned_value;
		for (int current_index = 0; line_to_check.length() > current_index; current_index++) {
			char32_t chr = line_to_check.get(current_index);
			if (chr == '\t' || chr == ' ') {
				continue;
			 else if (chr == '=') {
				foundNextEqual = true;
				assigned_value = line.right(current_index).strip_edges();
				assigned_value = assigned_value == "true" ? "false" : "true";
			 
				break;