fix(vouchers): ui-select on small screen

This commit makes sure that the UI-select on the complex vouchers page
has plenty of room to select accounts via the css class
`ui-grid-ui-select` applied to the `ui-matches` element.

All other `ui-select` elements in grids can take advantage of this class
to display themselves better.

Closes #873.

client/src/css/structure.css

@@ -836,3 +836,8 @@ growl-notification.fading.ng-leave.ng-leave-active {
 .progress-bar.ima-blue {
   background-color : #085484;
 }
+
+/* properly deal with ui-selects inside ui-grids */
+.ui-select-bootstrap > .ui-select-choices.ui-grid-ui-select {
+  width: initial;
+}

client/src/partials/vouchers/templates/account.grid.tmpl.html

@@ -11,6 +11,7 @@
    </ui-select-match>
    <ui-select-choices
      ui-select-focus-patch
+     class="ui-grid-ui-select"
      ui-disable-choice="account.type_id === grid.appScope.bhConstants.accounts.TITLE"
      repeat="account in grid.appScope.accounts | filter:$select.search">
      <strong ng-bind-html="account.number | highlight:$select.search"></strong>