RichLog shrink is shrinking renderable to min_width rather than the available width

[darrenburns]

When shrink=True, RichLog incorrectly shrinks the renderable down to RichLog.min_width. This is not what you'd expect and it doesn't align with the docstring.

Given the following snapshot test:

def test_richlog_shrink(snap_compare):
    class RichLogShrink(App[None]):
        CSS = "RichLog { width: 20; background: red;}"

        def compose(self) -> ComposeResult:
            rich_log = RichLog(min_width=4)
            panel = Panel("lorem ipsum dolor sit amet lorem ipsum dolor sit amet")
            rich_log.write(panel)  # shrink=True by default
            yield rich_log

    assert snap_compare(RichLogShrink(), terminal_size=(24, 6))

This outputs:

The Panel has shrunk down to width 4, rather than the available width.

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