Automatically enable project search filters when using Search Inside (#2889)

Now that the filters are hidden behind a toggle-able setting, running
the `Search Inside` action from the project panel feels a bit weird,
since the filter being used is hidden. This PR automatically opens that
filter section after running a `Search Inside` action.

Release Notes:

- N/A

crates/search/src/project_search.rs

@@ -893,6 +893,7 @@ impl ProjectSearchView {
             search
                 .included_files_editor
                 .update(cx, |editor, cx| editor.set_text(filter_str, cx));
+            search.filters_enabled = true;
             search.focus_query_editor(cx)
         });
     }