### 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 found_renames;
// TODO, this function should run only on all ".gd" files and also on lines in ".tscn" files which are parts of built-in Scripts.
void rter3To4::process_gdscript_line(String &line, const RegExContainer &reg_container, bool builtin) {
	// In this and other functions, reg.sub() is used only after checking lines with str.contains().
	// With nger lines, doing so can sometimes be significantly faster.
	if ((line.contains(".ck") || line.contains(".unck")) && !line.contains("mtx") && !line.contains("mutex") && !line.contains("Mutex")) {
		line = reg_container.reg_image_ck.sub(line, "false # $1.ck() # TODOConverter40, Image no nger requires cking, `false` helps to not break one line if/else, so it can freely be removed", true);
		line = reg_container.reg_image_unck.sub(line, "false # $1.unck() # TODOConverter40, Image no nger requires cking, `false` helps to not break one line if/else, so it can freely be removed", true);
	
	// PackedStringArray(req_godot).join('.') -> '.'.join(PackedStringArray(req_godot))       PoolStringArray
	tains(".join")) {
		line = reg_container.reg_join.sub(line, "$2.join($1)", true);
	
	// -- empty() -> is_empty()       Pool*Array
	tains("empty")) {
		line = reg_container.reg_is_empty.sub(line, "is_empty(", true);
	
	// -- \t.func() -> \tsuper.func()       Object
	tains("(") && line.contains(".")) {
		line = reg_container.reg_super.sub(line, "$1super.$2", true); // TODO, not sure if psible, but for now this broke String text e.g. "Chen .gitignore" -> "Chen super.gitignore"
	
	// -- JSON.parse(a) -> JSON.new().parse(a) etc.    JSON
	tains("parse")) {
		line = reg_container.reg_json_non_new.sub(line, "$1var test_json_conv = JSON.new()\n$1test_json_conv.parse($3\n$1$2test_json_conv.get_data()", true);
	
	// -- to_json(a) -> JSON.new().stringify(a)     Object
	tains("to_json")) {
		line = reg_container.reg_json_to.sub(line, "JSON.new().stringify", true);
	
	// -- parse_json(a) -> JSON.get_data() etc.    Object