[FIX] account: fix css of pencil to edit tax on vendor bill

Before when creating a vendor bill with a tax 15% and a price unit less than 87, the widget to edit the tax amount was wrongly displayed, the pencil and amount was broken into two lines. This fixes this behavior by ensuring that the all block stays together using the css property white-space: nowrap

closes odoo/odoo#37049

Signed-off-by: Cedric Snauwaert (csn) <csn@openerp.com>

addons/account/static/src/css/tax_group.css

@@ -2,6 +2,10 @@
     width: 100%;
 }
 
+.tax_group_edit {
+    white-space: nowrap;
+}
+
 .tax_group_edit:hover {
     color: #00A09D;
     cursor: pointer;