perf: Drop party_type index

It's covered by party_type + party index. So this is not required at all.

Party type is also a rarely used as most selective filter => By nature it has very low cardinality.

erpnext/accounts/doctype/gl_entry/gl_entry.json

@@ -86,8 +86,7 @@
    "fieldname": "party_type",
    "fieldtype": "Link",
    "label": "Party Type",
-   "options": "DocType",
-   "search_index": 1
+   "options": "DocType"
   },
   {
    "fieldname": "party",
@@ -359,7 +358,7 @@
  "idx": 1,
  "in_create": 1,
  "links": [],
- "modified": "2025-03-21 15:29:11.221890",
+ "modified": "2025-04-21 22:03:45.548936",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "GL Entry",
@@ -390,8 +389,9 @@
   }
  ],
  "quick_entry": 1,
+ "row_format": "Dynamic",
  "search_fields": "voucher_no,account,posting_date,against_voucher",
  "sort_field": "creation",
  "sort_order": "DESC",
  "states": []
-}
+}