### 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
tains("parse_json")) {
		line = reg_container.reg_json_parse.sub(line, "$1var test_json_conv = JSON.new()\n$1test_json_conv.parse($3\n$1$2test_json_conv.get_data()", true);
	
	// -- JSON.print( -> JSON.stringify(
	tains("JSON.print(")) {
		line = reg_container.reg_json_print.sub(line, "JSON.stringify(", true);
	
	// -- get_node(@ -> get_node(       Node
	tains("get_node")) {
		line = line.replace("get_node(@", "get_node(");
	
	// export(fat) var lifetime = 3.0 -> export var lifetime: fat = 3.0     GDScript
	tains("export")) {
		line = reg_container.reg_export.sub(line, "export var $2: $1");
	
	// export(String, 'AnonymousPro', 'CourierPrime') var _font_name = 'AnonymousPro' -> export var _font_name = 'AnonymousPro' #(String, 'AnonymousPro', 'CourierPrime')   GDScript
	tains("export")) {
		line = reg_container.reg_export_advanced.sub(line, "export var $2$3 # ($1)");
	
	// Setget Setget
	tains("setget")) {
		line = reg_container.reg_setget_setget.sub(line, "var $1$2: get = $4, set = $3", true);
	
	// Setget set
	tains("setget")) {
		line = reg_container.reg_setget_set.sub(line, "var $1$2: set = $3", true);
	
	// Setget get
	tains("setget")) {
		line = reg_container.reg_setget_get.sub(line, "var $1$2: get = $3", true);