style: adjust diff gap gutter button padding

Author: vipmax

anycode-base/src/styles.css

@@ -235,7 +235,6 @@
   justify-content: center;
   gap: 4px;
   border-radius: 8px 0 0 8px;
-  padding-left: 6px;
 }
 
 .diff-gap-gutter-btn {