[html-style-info] round amounts in price-render

prices may be rendered as exact fractions. ensure they are rounded,
with minimum of 4 decimal points.

gnucash/report/html-style-info.scm

@@ -163,7 +163,11 @@
 
 ;; renders a price to target currency
 (define (gnc:default-price-renderer currency amount)
-  (xaccPrintAmount amount (gnc-price-print-info currency #t)))
+  (xaccPrintAmount
+   (gnc-numeric-convert
+    amount (min 10000 (* 100 (gnc-commodity-get-fraction currency)))
+    GNC-HOW-RND-ROUND)
+   (gnc-price-print-info currency #t)))
 
 (define (gnc:default-html-gnc-monetary-renderer datum params)
   (let* ((comm (gnc:gnc-monetary-commodity datum))