[FIX] web_calendar: color of sidebar filter

Before this rev., if you went to Sales > Sales order, switched to
calendar view, edited the arch such that 'color="state"' is
replaced by 'color="invoice_status"' on the root node, it crashed.

The reason of the crash is that a possible value of the
'invoice_status' selection field is 'to invoice' (it contains a
whitespace), and the JQuery selector didn't wrap the value by
quotes.

OPW~1856305

addons/web_calendar/static/src/js/widgets.js

@@ -214,7 +214,7 @@ var SidebarFilter = Widget.extend({
         var self = this;
         _.forEach(self.view.all_filters, function(o) {
             if (_.contains(self.view.now_filter_ids, o.value)) {
-                self.$('div.o_calendar_responsible input[value=' + o.value + ']').prop('checked',o.is_checked);
+                self.$('div.o_calendar_responsible input[value="' + o.value + '"]').prop('checked',o.is_checked);
             }
         });
     },