Editor: Fix EditorHelpBit title height is wrong on initialization

[dalexeev]

• Fixes Editor settings tooltips have a huge bottom margin with compact spacing preset #93031.

The bug is caused by the fact that the title label uses fit_content = true, unlike the content label. At initialization, the width is still 0, which is why the calculated title height is too large.

Although this is not entirely true for non-tooltip EditorHelpBits, 512 * EDSCALE is already used below, so I think it's ok.

godot/editor/editor_help.cpp

Lines 3736 to 3738 in 292e50e

	title = memnew(RichTextLabel);
	title->set_theme_type_variation("EditorHelpBitTitle");
	title->set_fit_content(true);

godot/editor/editor_help.cpp

Lines 3748 to 3750 in 292e50e

	content = memnew(RichTextLabel);
	content->set_theme_type_variation("EditorHelpBitContent");
	content->set_custom_minimum_size(Size2(512 * EDSCALE, content_min_height));

[akien-mga]

Thanks!