fix: remove duplicate error checking in UpdateAccountPermission

[fbsobreira]

Remove redundant error checking block in pkg/client/account.go that was duplicated at lines 452-454.

Fixes #160

Description

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Refactoring (no functional changes, no API changes)
• Performance improvement

Ticket

TRON-160

How Has This Been Tested?

No need, just duplicated code.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• 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
• Any dependent changes have been merged and published