[Fix] Invalid Syntax in gstr_1.py  (#12946)

* [Fix] Added missing parenthesis in gstr_1.py

* Minor change
diff --git a/erpnext/regional/report/gstr_1/gstr_1.py b/erpnext/regional/report/gstr_1/gstr_1.py
index 9120923..c9ad8ec 100644
--- a/erpnext/regional/report/gstr_1/gstr_1.py
+++ b/erpnext/regional/report/gstr_1/gstr_1.py
@@ -119,8 +119,8 @@
 		if self.filters.get("type_of_business") ==  "B2C Large":
 			conditions += """ and SUBSTR(place_of_supply, 1, 2) != SUBSTR(company_gstin, 1, 2)
 				and grand_total > {0} and is_return != 1 and customer in ('{1}')""".\
-					format((flt(b2c_limit), "', '".join([frappe.db.escape(c.name) for c in customers])	)
-					
+					format(flt(b2c_limit), "', '".join([frappe.db.escape(c.name) for c in customers]))
+
 		elif self.filters.get("type_of_business") ==  "B2C Small":
 			conditions += """ and (
 				SUBSTR(place_of_supply, 1, 2) = SUBSTR(company_gstin, 1, 2)
@@ -483,4 +483,4 @@
 					"width": 120
 				}
 			]
-		self.columns = self.invoice_columns + self.tax_columns + self.other_columns
+		self.columns = self.invoice_columns + self.tax_columns + self.other_columns
\ No newline at end of file