recreate trigger with new name after renaming a table (SQlite2 only)

[Christopher Kramer]

When renaming a table (SQlite2 only), triggers need to be recreated with the new table name.

This was originally posted in issue #12 (https://bitbucket.org/phpliteadmin/public/issues/12/cannot-re-edit-table-remove-rename-columns#comment-19341459)