Fix Ubuntu Pro logo horizontal dance.

Nathan Teodosiorequested to merge
nteodosio/gnome-initial-setup:fix-pro-logo into ubuntu/latest

In the Ubuntu Pro page the logo is not aligned to the left and also dances around depending on the window dimensions.

Fix by replacing GtkBox with GtkGrid. All the attempts with hexpand and halign were in vain.

LP:2065789

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