ColorPicker: ignore TextureRect expand mode during legacy picking

The color picker has a "legacy" fallback mode when
`FEATURE_SCREEN_CAPTURE` is not supported by the current
`DisplayServer`. It works by "freezing" the current view by making a
huge `Popup` with a `TextureRect` inside covering the screen.

Before this patch, said `TextureRect` could get cut off if its buffer
was nominally bigger than the parent popup, such as when the
`canvas_items` content scale mode is active.

This is because the default TextureRect scaling logic only allows
expanding the texture up. `EXPAND_IGNORE_SIZE` fixes that by allowing
the texture to logically "shrink", filling the whole screen
independently of the actual buffer size.

Special thanks to Federico Fausto Santoro for helping with the diagnosis
:D

Co-Authored-By: Federico Fausto Santoro <fedyfausto@hotmail.com>

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