Fix: Validators table and cron job

[brancoder]

Description of change

Fix Candidates and Elected columns on Validators page table
closes #1413

Reduces validator cron job to 10 mins
closes #1412

Type of change

• Bug fix (a non-breaking change which fixes an issue)

Change checklist

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes