Correct tab height
Correct tab height

When showing the sidebar the highlighted line of open files didn't align with the tabs by a difference of 2px. By reducing the height of both to 26px instead of 28px it's looks even more cleaner.
qiuyesuifeng/spacegray,mjrev/spacegray,ericmatthys/spacegray-oceanic-next,kkga/spacegray,jay3126/spacegray,mhkeller/spacegray,mjrev/spacegray,wengyulin/spacegray,marcofugaro/spacegray,mjrev/spacegray,VikingDen/spacegray,wangtingbang/spacegray,mhkeller/spacegray