LibGUI: Make "Home" key behavior comfier on wrapped lines :^)

There's a big comment explaining it because it's somewhat confusing, but
the behavior I'm copying from other editors is, when you repeatedly
press the `Home` key:

1. Go to the start of the visual line, where it wraps.
2. Go to the first non-whitespace character on the logical line, which
   is what happens in non-wrapped lines.
3. Go to column 0.
4. GOTO 2

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