### Godot version

4.1.1

### System information

linux

### Issue description

The `"%+f"` format adds a `+` sign in front of positive numbers. If you try to format `-0.0`, it breaks and displays both a `+` and a `-`.

### Steps to reproduce

```gdscript
@tool
extends EditorScript

func _run() -> void:
    print("%+f" % -0.0)
```

### Minimal reproduction project

see above
int len = 0;
	while (p_src_len) {
		if (*p_src == '&') {
			int eat = 0;
			if (p_src_len >= 4 && p_src[1] == '#') {
				char32_t c = 0;
				bool overflow = false;
				if (p_src[2] == 'x') {
					// 
					for (int i = 3; i < p_src_len; i++) {
						eat = i + 1;
						char32_t ct = p_src[i];
						if (ct == ';') {
							break;
						} else if (is_digit(ct)) {
							ct = ct - '0';
						} else if (ct >= 'a' && ct <= 'f') {
							ct = (ct - 'a') + 10;
						} else if (ct >= 'A' && ct <= 'F') {
							ct = (ct - 'A') + 10;
						} else {
							break;
						}
						if (c > (UINT32_MAX >> 4)) {
							overflow = true;
							break;
						}
						c <<= 4;
						c |= ct;