Update popover function call method signature

Currently on line #275
`$('a[rel=popover]').popover({ html: 'true',`

html true where `'true'` is within quotes, Which causes issue when trying to open popover. As popover expects Boolean. As mentioned at: https://github.com/akaunting/akaunting/issues/url

resources/views/incomes/invoices/create.blade.php

@@ -272,7 +272,7 @@
             });
 
             $('a[rel=popover]').popover({
-                html: 'true',
+                html: true,
                 placement: 'bottom',
                 title: '{{ trans('invoices.discount') }}',
                 content: function () {