### Godot version

v4.1.stable.official [970459615]

### System information

Windows 11

### Issue description

Using `String::pad_zeros` on a string containing digits with greater length than the argument `digits` raises the error `Parameter count should be a positive number.` of `String::repeat`, because it is called with a negative parameter.
(Actually this error is not 100% correct, it should be non-negative)

4.0 Code:
https://github.com/godotengine/godot/blob/c8e0bd50c57de91c061866db1de407f2e7a74acd/core/string/ustring.cpp#L4127-L4155

Example: `"2023".pad_zeros(2)`
`begin == 0`
`end == 4`
`end - begin < p_digits == false` => No "0" is inserted, the string is returned unchanged.

4.1 Code:
https://github.com/godotengine/godot/blob/ce5c6151fc498b39fe0c188045a4685e0f627854/core/string/ustring.cpp#L4266-L4290

Example: `"2023".pad_zeros(2)`
`begin == 0`
`end == 4`
`zeros_to_add == 2 - (4 - 0) == -2`
=> `s.insert(0, String("0").repeat(-2))` is called => Error.

I don't know why this was changed, but I think ensuring that `zeros_to_add > 0` should be ensured internally and not by the user. If this condition is not fullfilled the string should be returned unchanged as in the 4.0 implementation.

### Steps to reproduce

Try my above mentioned example in 4.0 and 4.1

### Minimal reproduction project

Not necessary.
} else if (p_num < 1024) {
		return 1;
	} else {
		return 0;
	}
}
 ::humanize_size(uint64_t p_size) {
	uint64_t _div = 1;
	Vector<> prefixes;
	prefixes.push_back(RTR("B"));
	prefixes.push_back(RTR("KiB"));
	prefixes.push_back(RTR("MiB"));
	prefixes.push_back(RTR("GiB"));
	prefixes.push_back(RTR("TiB"));
	prefixes.push_back(RTR("PiB"));
	prefixes.push_back(RTR("EiB"));
	int prefix_idx = 0;
	while (prefix_idx < prefixes.size() - 1 && p_size > (_div * 1024)) {
		_div *= 1024;
		prefix_idx++;
	}
	const int digits = prefix_idx > 0 ? _humanize_digits(p_size / _div) : 0;
	const double divisor = prefix_idx > 0 ? _div : 1;
	return ::num(p_size / divisor).pad_decimals(digits) + " " + prefixes[prefix_idx];
}
bool ::is_absolute_path() const {
	if (length() > 1) {
		return (operator[](0) == '/' || operator[](0) == '\\' || find(":/") != -1 || find(":\\") != -1);
	} else if ((length()) == 1) {
		return (operator[](0) == '/' || operator[](0) == '\\');