fix: payments irrespective of party types (backport #37828)

[dj12djdjs]

I didn't want to overwrite the changes in #38630 in case I've made an error during rebase.

continuation of: #38630
backport of: #37828

[barredterra]

@dj12djdjs did you also consider this follow-up to the original PR? #38071

Also, these validations we're removing in the backend still exist in the frontend, even on the develop branch:

erpnext/erpnext/accounts/doctype/payment_entry/payment_entry.js

Lines 1089 to 1107 in 0633484

	if (paid_amount > total_negative_outstanding) {
	if (total_negative_outstanding == 0) {
	frappe.msgprint(
	__("Cannot {0} {1} {2} without any negative outstanding invoice", [
	frm.doc.payment_type,
	frm.doc.party_type == "Customer" ? "to" : "from",
	frm.doc.party_type,
	])
	);
	return false;
	} else {
	frappe.msgprint(
	__("Paid Amount cannot be greater than total negative outstanding amount {0}", [
	total_negative_outstanding,
	])
	);
	return false;
	}
	} else {

Is this on purpose?

[dj12djdjs]

@barredterra I noticed that, my customer wasn't to picky about it and just ignored the popup.

It should be removed from the frontend. Will rebase and remove that logic.

[dj12djdjs]

@barredterra I think it makes sense to reverse the original if condition since we're removing the path that triggered the validation. I haven't spent much time reading this section of PE logic. Do you have any initial doubts about this?