Remove banner prompting to migrate from Aave v2

[yivlad]

General Changes

• Removes banner prompting to migrate from Aave v2

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[krzkaczor]

showMigrateButton is still used in this file (for mobile version) please remove as well.

[yivlad]

showMigrateButton is still used in this file (for mobile version) please remove as well.

It's used for the button on the right side - should we remove it as well?

[krzkaczor]

@yivlad i think so. It's the same thing.