[Bug-Fix] accounts_receivable.html

[bibinqcs]

In the print format and PDF the total was showing as 0 (Zero) , when I made these changes it fixed the issue

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[bibinqcs]

I just went thru the Pull Request Checklist -
Explanantion -
The Total Amount was not showing in the print and PDF format for the reports accounts receivable and accounts payable, so upon closer inspection of the accounts_receivable.html the issue was the field names were not matching, when I corrected that, the reports print and PDF format now displays the total row in the bottom
check the screen shots below.
After the code change

Before the code change

Thank you