fix: update remove button icon in AddTabsList

[kud]

Replace the trash icon with a minus icon for the remove button in the AddTabsList component. The trash icon might give users the impression that they are removing something significant, like deleting the tab from Firefox entirely, which is not the case. Instead, it should simply indicate the removal of a tab from the saved tabs action. This change improves visual consistency and better aligns the icon with the intended action of closing or removing a tab.