Change CTRL|SHIFT W to close pane instead of tab

This allows more fine grain control when using multiple panes in
multiplexed tabs when e.g. a shell becomes unresponsive in a specific
pane the whole tab does not need to be closed.

wezterm.lua

@@ -39,6 +39,11 @@ config.keys = {
       end),
     }),
   },
+  {
+    key = 'w',
+    mods = 'CTRL|SHIFT',
+    action = wezterm.action.CloseCurrentPane { confirm = true },
+  },
 }
 
 local move_mods = 'CTRL|SHIFT'