### 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
if (*p == '+') {
				p += 1;
			}
			expSign = false;
		}
		if (!is_digit(char32_t(*p))) {
			p = pExp;
			goto done;
		}
		while (is_digit(char32_t(*p))) {
			exp = exp * 10 + (*p - '0');
			p += 1;
		}
	}
	if (expSign) {
		exp = fracExp - exp;
	} else {
		exp = fracExp + exp;
	}
	/*
	 * Generate a floating-point number that represents the exponent. Do this
	 * by processing the exponent one bit at a time to combine many powers of
	 * 2 of 10. Then combine the exponent with the fraction.
	 */
	if (exp < 0) {
		expSign = true;
		exp = -exp;
	} else {
		expSign = false;
	}