New remove current palette feature (#239)

* New remove current palette feature

This commit adds new feature to Pixelorama that will allow user to remove the current selected palette.

* Fixed grammar and added focus_mode = 0 on the remove palette button

Co-authored-by: OverloadedOrama <35376950+OverloadedOrama@users.noreply.github.com>

assets/graphics/dark_themes/palette/remove_palette.png.import

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assets/graphics/light_themes/palette/remove_palette.png.import

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