fix:Unable to pause job card (#42839)

fix: unable to pause job card

Pause operation creates "Value missing for: Completed Qty" error. That field was mandatory but it's non mandatory in v15.

erpnext/manufacturing/doctype/job_card_time_log/job_card_time_log.json

@@ -43,7 +43,7 @@
    "fieldtype": "Float",
    "in_list_view": 1,
    "label": "Completed Qty",
-   "reqd": 1
+   "reqd": 0
   },
   {
    "fieldname": "employee",
@@ -74,4 +74,4 @@
  "sort_field": "modified",
  "sort_order": "ASC",
  "track_changes": 1
-}
+}