[cpu] use margins instead of spacing in process rows

cpu-widget/cpu-widget.lua

@@ -57,7 +57,7 @@ local function worker(args)
 
     local is_update = true
     local process_rows = {
-        spacing = 8,
+        -- spacing = 8,
         layout = wibox.layout.fixed.vertical,
     }
 
@@ -190,6 +190,7 @@ local function worker(args)
                             local cmd = columns[5]
 
                             local row = wibox.widget {
+                                {
                                     {
                                         {
                                             text = pid,
@@ -216,6 +217,10 @@ local function worker(args)
                                         },
                                         layout = wibox.layout.align.horizontal
                                     },
+                                    top = 4,
+                                    bottom = 4,
+                                    widget = wibox.container.margin
+                                },
                                 widget = wibox.container.background
                             }