fix: Set default value for Packing Unit as 0

The default value 1 assumes Items will be always packed in integer
quantities. This is not the usual case.
diff --git a/erpnext/stock/doctype/item_price/item_price.json b/erpnext/stock/doctype/item_price/item_price.json
index 593f8b4..9e29ad0 100644
--- a/erpnext/stock/doctype/item_price/item_price.json
+++ b/erpnext/stock/doctype/item_price/item_price.json
@@ -1,953 +1,981 @@
 {
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- "autoname": "",
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- "creation": "2013-05-02 16:29:48",
- "custom": 0,
- "description": "Multiple Item prices.",
- "docstatus": 0,
- "doctype": "DocType",
- "document_type": "Setup",
- "editable_grid": 0,
- "engine": "InnoDB",
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+ "creation": "2013-05-02 16:29:48", 
+ "custom": 0, 
+ "description": "Multiple Item prices.", 
+ "docstatus": 0, 
+ "doctype": "DocType", 
+ "document_type": "Setup", 
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+ "engine": "InnoDB", 
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