[FIX] web,web_tests: delete button in editable list views

Use a fontawesome icon instead of no more supported mnmliconsRegular.

addons/web/static/src/js/views/list_view.js

@@ -1023,7 +1023,7 @@ ListView.List = Class.extend( /** @lends instance.web.ListView.List# */{
                 $(self).trigger(
                         'selected', [selection.ids, selection.records, ! checked]);
             })
-            .delegate('td.oe_list_record_delete button', 'click', function (e) {
+            .delegate('td.oe_list_record_delete', 'click', function (e) {
                 e.stopPropagation();
                 var $row = $(e.target).closest('tr');
                 $(self).trigger('deleted', [[self.row_id($row)]]);
@@ -1165,7 +1165,7 @@ ListView.List = Class.extend( /** @lends instance.web.ListView.List# */{
             cells.push('<td title="' + column.string + '">&nbsp;</td>');
         });
         if (this.options.deletable) {
-            cells.push('<td class="oe_list_record_delete"><button type="button" style="visibility: hidden"> </button></td>');
+            cells.push('<td class="oe_list_record_delete"></td>');
         }
         cells.unshift('<tr>');
         cells.push('</tr>');

addons/web/static/src/xml/base.xml

@@ -740,7 +740,7 @@
             ><t t-raw="render_cell(record, column)"/></td>
     </t>
     <td t-if="options.deletable" class='oe_list_record_delete' width="13px">
-        <button type="button" name="delete" class="oe_i">d</button>
+        <span name="delete" class="fa fa-trash-o"/>
     </td>
 </tr>
 <t t-extend="ListView.buttons">

addons/web_tests/static/src/js/web.tour.js

@@ -246,12 +246,12 @@ Tour.register({
             title:      "remove b",
             waitNot:    '.modal',
             waitFor:    '.oe_list_field_text:contains(aaa)',
-            element:    'tr:has(.oe_list_field_cell:containsExact(bbb)) .oe_list_record_delete button'
+            element:    'tr:has(.oe_list_field_cell:containsExact(bbb)) .oe_list_record_delete'
         },
         {
             title:      "remove e",
             waitNot:    'tr:has(.oe_list_field_cell:containsExact(bbb))',
-            element:    'tr:has(.oe_list_field_cell:containsExact(e)) .oe_list_record_delete button'
+            element:    'tr:has(.oe_list_field_cell:containsExact(e)) .oe_list_record_delete'
         },
 
         // save
@@ -440,7 +440,7 @@ Tour.register({
 
         {
             title:      "delete the last item in the editable list",
-            element:    '.oe_list_record_delete button:visible:last',
+            element:    '.oe_list_record_delete:visible:last',
         },
         {
             title:      "test one2many onchange after delete",