fix: Fixed Budget Variance Graph color from all black to default

erpnext/accounts/report/budget_variance_report/budget_variance_report.py

@@ -397,6 +397,7 @@ def get_chart_data(filters, columns, data):
 				{'name': 'Budget', 'chartType': 'bar', 'values': budget_values},
 				{'name': 'Actual Expense', 'chartType': 'bar', 'values': actual_values}
 			]
-		}
+		},
+		'type' : 'bar'
 	}