binding: remove unused minimize binding

rc/bindings.lua

@@ -64,12 +64,6 @@ config.keys.client = awful.util.table.join(
 	     function (c)
 		c.maximized_horizontal = not c.maximized_horizontal
 		c.maximized_vertical   = not c.maximized_vertical
-	     end),
-   awful.key({ modkey,           }, "i",
-	     function (c)
-		-- The client currently has the input focus, so it cannot be
-		-- minimized, since minimized clients can't have the focus.
-		c.minimized = true
 	     end)
 )