Set default limit on creation of new qe and on run (#6400)

superset/assets/src/SqlLab/components/SqlEditor.jsx

@@ -149,7 +149,7 @@ class SqlEditor extends React.PureComponent {
       schema: qe.schema,
       tempTableName: ctas ? this.state.ctas : '',
       templateParams: qe.templateParams,
-      queryLimit: qe.queryLimit,
+      queryLimit: qe.queryLimit || this.props.defaultQueryLimit,
       runAsync,
       ctas,
     };

superset/assets/src/SqlLab/components/TabbedSqlEditors.jsx

@@ -138,6 +138,7 @@ class TabbedSqlEditors extends React.PureComponent {
       sql: `${t(
         '-- Note: Unless you save your query, these tabs will NOT persist if you clear your cookies or change browsers.',
       )}\n\nSELECT ...`,
+      queryLimit: this.props.defaultQueryLimit,
     };
     this.props.actions.addQueryEditor(qe);
   }