cabana: fix overlap in byte highlighting (commaai#27139)

Author: pd0wm

tools/cabana/util.cc

@@ -85,7 +85,7 @@ void MessageBytesDelegate::paint(QPainter *painter, const QStyleOptionViewItem &
   pos.moveLeft(pos.x() + space.width());
 
   int m = space.width() / 2;
-  const QMargins margins(m + 1, m, m, m);
+  const QMargins margins(m, m, m, m);
 
   int i = 0;
   for (auto &byte : opt.text.split(" ")) {