Apply fix_potential_double_encoding() to table/object comment fields
returned by list_tables(), list_table_status_show(), and row_to_object(),
consistent with the existing fix for column comments (c21b5d0).
The sidebar tree displays TABLE_COMMENT directly from these functions,
so when MySQL returns Latin1-decoded bytes for UTF-8 content, the
comment shows as garbled text like 'OAéƒ¨é—¨åŒæ¥è¡¨' instead of
'OA部门同步表'.