db manager: re-enable margins with line numbers in sql editor

(fixes #15110)

Author: jef-n

python/plugins/db_manager/dlg_sql_window.py

@@ -70,6 +70,7 @@ def __init__(self, iface, db, parent=None):
 
         self.editSql.setFocus()
         self.editSql.setVerticalScrollBarPolicy(Qt.ScrollBarAsNeeded)
+        self.editSql.setMarginVisible(True)
         self.initCompleter()
 
         # allow copying results

src/gui/qgscodeeditor.h

@@ -39,8 +39,8 @@ class GUI_EXPORT QgsCodeEditor : public QsciScintilla
      *
      * @param parent The parent QWidget
      * @param title The title to show in the code editor dialog
-     * @param folding False: Enable margin for code editor
-     * @param margin False: Enable folding for code editor
+     * @param folding false: Enable folding for code editor
+     * @param margin false: Enable margin for code editor
      * @note added in 2.6
      */
     QgsCodeEditor( QWidget *parent = nullptr, const QString& title = "", bool folding = false, bool margin = false );