### 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
HBoxContainer *hb_edit = memnew(HBoxContainer);
	add_child(hb_edit, false, INTERNAL_MODE_FRONT);
	hb_edit->set_v_size_flags(SIZE_SHRINK_BEGIN);
	uv_edit = memnew(Control);
	hb_edit->add_child(uv_edit);
	uv_edit->connect("gui_input", callable_mp(this, &ColorPicker::_uv_input).bind(uv_edit));
	uv_edit->set_mouse_filter(MOUSE_FILTER_PASS);
	uv_edit->set_h_size_flags(SIZE_EXPAND_FILL);
	uv_edit->set_v_size_flags(SIZE_EXPAND_FILL);
	uv_edit->connect("draw", callable_mp(this, &ColorPicker::_hsv_draw).bind(0, uv_edit));
	sample_hbc = memnew(HBoxContainer);
	add_child(sample_hbc, false, INTERNAL_MODE_FRONT);
	btn_pick = memnew(Button);
	sample_hbc->add_child(btn_pick);
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_SCREEN_CAPTURE)) {
		btn_pick->set_tooltip_text(RTR("Pick a color from the screen."));
		btn_pick->connect(SNAME("pressed"), callable_mp(this, &ColorPicker::_pick_button_pressed));
	} else {
		
		btn_pick->set_tooltip_text(RTR("Pick a color from the application window."));
		btn_pick->connect(SNAME("pressed"), callable_mp(this, &ColorPicker::_pick_button_pressed_legacy));
	}
	sample = memnew(TextureRect);