TableColumn.Header(IRenderable) method updates the footer

[mattfennerom]

Information

• OS: [Windows]
• Version: [0.50.0]
• Terminal: [Windows Terminal]

Describe the bug
calling Header updates the Footer

To Reproduce
new Table()
.AddColumn(new Text("foo"))
.Header(new Text("bar"))

Expected behavior
Header should be "bar" and no footer

Screenshots

Additional context
Typo in the code

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