Don't honor padding config in multi-diff editors

[alexdima]

Testing #199155

• configure

"editor.padding.bottom": 10,
"editor.padding.top": 10,

• the padding is respected in the multi diff editors
• this is debateable, but I don't expect this setting to be automatically honored in the multi-diff editor. The reason I configured this padding is for the large editors to leave some gaps above and below the regular editors.
• otherwise, it would be nice to let me configure things in such a way that there is no padding