### 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
int end = get_end_parenthesis(line.substr(start)) + 1;
		if (end > -1) {
			Vector<String> parts = parse_arguments(line.substr(start, end));
			.size() == 0) {
				line = line.substr(0, start) + "DisplayServer.get_display_safe_area()" + line.substr(end + start);
			
		
	
	//  draw_rect(a,b,c,d,e)  ->   draw_rect(a,b,c,d)#e) TODOGODOT4 Antialiasing argument is missing
	tains("draw_rect(")) {
		int start = line.find("draw_rect(");
		int end = get_end_parenthesis(line.substr(start)) + 1;
		if (end > -1) {
			Vector<String> parts = parse_arguments(line.substr(start, end));
			.size() == 5) {
				line = line.substr(0, start) + "draw_rect(" + parts[0] + "," + parts[1] + "," + parts[2] + "," + parts[3] + ")" + line.substr(end + start) + "# " + parts[4] + ") TODOGODOT4 Antialiasing argument is missing";
			
		
	
	// get_focus_owner() -> get_viewport().gui_get_focus_owner()
	tains("get_focus_owner()")) {
		line = line.replace("get_focus_owner()", "get_viewport().gui_get_focus_owner()");
	
	// button.pressed = 1 -> button.button_pressed = 1
	tains(".pressed")) {
		int start = line.find(".pressed");
		bool foundNextEqual = false;
		String line_to_check = line.substr(start + String(".pressed").length());
		for (int current_index = 0; line_to_check.length() > current_index; current_index++) {
			char32_t chr = line_to_check.get(current_index);