[minor] added columns to pos print_template (#8978)

diff --git a/erpnext/accounts/page/pos/pos.js b/erpnext/accounts/page/pos/pos.js
index 026cdc0..9261fa4 100644
--- a/erpnext/accounts/page/pos/pos.js
+++ b/erpnext/accounts/page/pos/pos.js
@@ -361,7 +361,8 @@
 			print_settings: this.print_settings,
 			header: this.letter_head.header,
 			footer: this.letter_head.footer,
-			landscape: false
+			landscape: false,
+			columns: []
 		})
 	},