### Godot version

4.0.2.stable.official [7a0977ce2]

### System information

Windows 10

### Issue description

LineEdit node with enabled "expand_to_text_length" option and "minimum_character_width = 0" and cleared margins in style overrides still has some empty space inside
![node](https://github.com/godotengine/godot/assets/23380802/86c79678-8422-4a98-8406-602edd7dc48b)
![node settings](https://github.com/godotengine/godot/assets/23380802/11d04d71-bbf1-4c16-8155-fe39b5bbd66b)
![style overrides](https://github.com/godotengine/godot/assets/23380802/6b3c3925-b4bd-455b-aac1-ddeb54a4d796)


### Steps to reproduce

1. Add LineEdit node
2. Set expand_to_text_length = true
3. Set minimum_character_width in theme overrides = 0
4. Set normal to StyleBoxEmpty


### Minimal reproduction project

[LineEdit can't be zero sized.zip](https://github.com/godotengine/godot/files/11566017/LineEdit.can.t.be.zero.sized.zip)

selection_delete();
		return;
	}
	int text_len = text.length();
	if (caret_column == text_len) {
		return; 
	}
	if (p_word) {
		int cc = caret_column;
		PackedInt32Array words = TS->shaped_text_get_word_breaks(text_rid);
		for (int i = 1; i < words.size(); i = i + 2) {
			if (words[i] > cc) {
				cc = words[i];
				break;
			}
		}
		delete_text(caret_column, cc);
		set_caret_column(caret_column);
	} else {
		if (caret_mid_grapheme_enabled) {
			set_caret_column(caret_column + 1);
			delete_char();
		} else {
			int cc = caret_column;
			set_caret_column(TS->shaped_text_next_grapheme_pos(text_rid, caret_column));
			delete_text(cc, caret_column);
		}
	}
}
void LineEdit::unhandled_key_input(const Ref<InputEvent> &p_event) {