Adjust styling to make grid config look better

Author: BatJan

src/Umbraco.Web.UI.Client/src/less/gridview.less

@@ -621,7 +621,6 @@
 	}
 
 	.preview-rows {
-
 		display: inline-block;
 		position: relative;
 		box-sizing: border-box;
@@ -675,9 +674,9 @@
 	}
 
 	.preview-rows.columns {
-		min-height: 18px;
+		min-height: 16px;
 		line-height: 11px;
-		padding: 1px;
+        padding: 0 1px 1px 1px;
 
         &.prevalues-rows {
             min-height: 30px;