### 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.
if (base.get_slice_count(":") > 2) {
			return ERR_INVALID_PARAMETER;
		}
		pos = base.rfind(":");
		if (pos == -1) {
			r_host = base;
			base = "";
		} else {
			r_host = base.substr(0, pos);
			base = base.substr(pos, base.length() - pos);
		}
	}
	if (r_host.is_empty()) {
		return ERR_INVALID_PARAMETER;
	}
	r_host = r_host.to_lower();
	
	if (base.begins_with(":")) {
		base = base.substr(1, base.length() - 1);
		if (!base.is_valid_int()) {
			return ERR_INVALID_PARAMETER;
		}
		r_port = base.to_int();
		if (r_port < 1 || r_port > 65535) {
			return ERR_INVALID_PARAMETER;
		}
	}
	return OK;
}
void ::copy_from(const char *p_cstr) {