fix: in payment_entry 'Unallocated Amount' cal is broken (#36369)

fix: in payment_entry 'Unallocated Amount' cal is broken

(cherry picked from commit f9fa34f)

Co-authored-by: Ashish Shah <mr.ashish.shah@gmail.com>

erpnext/accounts/doctype/payment_entry/payment_entry.js

@@ -894,12 +894,12 @@ frappe.ui.form.on('Payment Entry', {
 			if(frm.doc.payment_type == "Receive"
 				&& frm.doc.base_total_allocated_amount < frm.doc.base_received_amount + total_deductions
 				&& frm.doc.total_allocated_amount < frm.doc.paid_amount + (total_deductions / frm.doc.source_exchange_rate)) {
-					unallocated_amount = (frm.doc.base_received_amount + total_deductions + frm.doc.base_total_taxes_and_charges
+					unallocated_amount = (frm.doc.base_received_amount + total_deductions + flt(frm.doc.base_total_taxes_and_charges)
 						- frm.doc.base_total_allocated_amount) / frm.doc.source_exchange_rate;
 			} else if (frm.doc.payment_type == "Pay"
 				&& frm.doc.base_total_allocated_amount < frm.doc.base_paid_amount - total_deductions
 				&& frm.doc.total_allocated_amount < frm.doc.received_amount + (total_deductions / frm.doc.target_exchange_rate)) {
-					unallocated_amount = (frm.doc.base_paid_amount + frm.doc.base_total_taxes_and_charges - (total_deductions
+					unallocated_amount = (frm.doc.base_paid_amount + flt(frm.doc.base_total_taxes_and_charges) - (total_deductions
 						+ frm.doc.base_total_allocated_amount)) / frm.doc.target_exchange_rate;
 			}
 		}