Fix #15425 - Backslash in column name resulting an error in editing

Fixes: #15425
Pull-request: #15455

Signed-off-by: William Desportes <williamdes@wdes.fr>

libraries/classes/Controllers/Table/TableStructureController.php

@@ -524,7 +524,7 @@ class TableStructureController extends TableController
         $fields_meta = array();
         for ($i = 0; $i < $selected_cnt; $i++) {
             $value = $this->dbi->getColumns(
-                $this->db, $this->table, $selected[$i], true
+                $this->db, $this->table, $this->dbi->escapeString($selected[$i]), true
             );
             if (count($value) == 0) {
                 $message = Message::error(