the 'Objects' tab in the 'Backup' window is broken on v9.12

[martinhamon2]

Please note that security bugs or issues should be reported to security@pgadmin.org.

Describe the bug

The 'Objects' tab in the 'Backup' window does not work properly on pgadmin v9.12, it doesn't backup only the selected tables but all of the tables. (It does work om pgadmin version 9.8 though)

To Reproduce

Steps to reproduce the behavior:

1. Go to any database or schema and choose the backup option, then use the 'Objects' tab to deselect some of the tables
2. Click on backup and then view process and check if the tables you excluded are included anyways
3. If they are it means that you just found the bug

Expected behavior

The excluded tables should not be included

Screenshots

> table 'sdb' not included > the process still includes the table 'sdb'

Desktop (please complete the following information):

• OS: Windows 11
• pgAdmin version: 9.12
• Mode: Desktop

[anilsahoo20]

Related to #9110