### Godot version

v4.1.stable.official [970459615]

### System information

Godot v4.1.stable - Pop!_OS 22.04 LTS - Vulkan (Compatibility) - NVIDIA GeForce MX350 (nvidia; 525.116.04) - 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz (8 Threads)

### Issue description

When I use the color picker to change a color, I can paste an HTML color code or write it myself. I can also prefix my text with a `#`  &mdash; the color picker will accept it as a valid color and update the corresponding element with that color. This is especially useful when I copy an HTML color code from a color palette like the one on lospec.com, since they always have a hash in front of them.

However, I cannot paste HTML color codes with surrounding spaces into this text box, even though the color code (without the spaces) is valid.

I would definitely call this behaviour a bug, since other programs like Affinity Designer, Blender or Gimp are very permissive about the input of HTML color codes. Or according to Jon Postel, *Be conservative in what you send, be liberal in what you accept.*

### Steps to reproduce

Preparation: 

1. create a new Godot project
2. create a new 2d scene
3. add a ColorRect node.
4. open the color picker for the color attribute in the inspector tab.

Explore the bug:

1. enter a valid HTML color code like `000` (black) => color is updated.
2. enter a valid HTML color code like `#fff` (white) => color is updated.
3. enter a valid HTML color code with leading space, for example `   #000` => color is not updated.
4. enter a valid HTML color code like `#000`(black) => color is updated.
5. enter a valid HTML color code with surrounding spaces, e.g. `   fff   ` => color is not updated.
6. enter a valid HTML color code like `fff`=> color is updated.

### Minimal reproduction project

N/A
sample_hbc->add_child(sample);
	sample->set_h_size_flags(SIZE_EXPAND_FILL);
	sample->connect("gui_input", callable_mp(this, &ColorPicker::_sample_input));
	sample->connect("draw", callable_mp(this, &ColorPicker::_sample_draw));
	btn_shape = memnew(MenuButton);
	btn_shape->set_flat(false);
	sample_hbc->add_child(btn_shape);
	btn_shape->set_toggle_mode(true);
	btn_shape->set_tooltip_text(RTR("Select a picker shape."));
	current_shape = SHAPE_HSV_RECTANGLE;
	shape_popup = btn_shape->get_popup();
	shape_popup->add_radio_check_item("HSV Rectangle", SHAPE_HSV_RECTANGLE);
	shape_popup->add_radio_check_item("HSV Wheel", SHAPE_HSV_WHEEL);
	shape_popup->add_radio_check_item("VHS Circle", SHAPE_VHS_CIRCLE);
	shape_popup->add_radio_check_item("OKHSL Circle", SHAPE_OKHSL_CIRCLE);
	shape_popup->set_item_checked(current_shape, true);
	shape_popup->connect("id_pressed", callable_mp(this, &ColorPicker::set_picker_shape));
	btn_shape->set_icon(shape_popup->get_item_icon(current_shape));
	add_mode(new ColorModeRGB(this));
	add_mode(new ColorModeHSV(this));
	add_mode(new ColorModeRAW(this));
	add_mode(new ColorModeOKHSL(this));
	mode_hbc = memnew(HBoxContainer);
	add_child(mode_hbc, false, INTERNAL_MODE_FRONT);
	mode_group.instantiate();
	for (int i = 0; i < MODE_BUTTON_COUNT; i++) {
		mode_btns[i] = memnew(Button);
		mode_hbc->add_child(mode_btns[i]);
		mode_btns[i]->set_focus_mode(FOCUS_NONE);
		mode_btns[i]->set_h_size_flags(SIZE_EXPAND_FILL);