[FIX] account: invoice report taxes and discount align

These columns were mis-aligned
compared to the other columns.

Besides, this copy the behavior in the sale
order report, done in revision
71c624163c.

opw-650235

addons/account/views/report_invoice.xml

@@ -56,8 +56,8 @@
                         <th>Description</th>
                         <th class="text-right">Quantity</th>
                         <th class="text-right">Unit Price</th>
-                        <th groups="sale.group_discount_per_so_line">Disc.(%)</th>
-                        <th>Taxes</th>
+                        <th class="text-right" groups="sale.group_discount_per_so_line">Disc.(%)</th>
+                        <th class="text-right">Taxes</th>
                         <th class="text-right">Price</th>
                     </tr>
                 </thead>