fix: data column in SQL lab left panel open by default (#13624)

* fix table expand

* Left Panel Expand

* added tests

Co-authored-by: Elizabeth Thompson <eschutho@gmail.com>

superset-frontend/spec/javascripts/sqllab/reducers/sqlLab_spec.js

@@ -153,6 +153,7 @@ describe('sqlLabReducer', () => {
     it('should add a table', () => {
       // Testing that beforeEach actually added the table
       expect(newState.tables).toHaveLength(1);
+      expect(newState.tables[0].expanded).toBe(true);
     });
     it('should merge the table attributes', () => {
       // Merging the extra attribute