[add] Save filters to dashboard (#3183)

* [add] Save filters to dashboard

* format code

* fix CI error

* add semicolon  semi

* fix none object

* add test data
optimize the js code
fix the compatibility issue

* fix urllib to urllib.parse

* add space

* update test case

* remove  'return'

* fix error

* update test case

superset/assets/javascripts/dashboard/components/SaveModal.jsx

@@ -80,6 +80,7 @@ class SaveModal extends React.PureComponent {
       css: this.state.css,
       expanded_slices: expandedSlices,
       dashboard_title: dashboard.dashboard_title,
+      default_filters: dashboard.readFilters(),
     };
     let url = null;
     if (saveType === 'overwrite') {