Some forum code cleanup

[rica-carv]

Motivation and Context

Forum code has unused variables, and some hardcoded shortcodes. This is probably the start of that changes...

Description

Cleared some variables unecessary inside code scope

How Has This Been Tested?

Tested with v2.3.3

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Performance enhancement (non-breaking change which improves efficiency)
• [x] Code cleanup (non-breaking change which makes code smaller or more readable)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (a change to man pages or other documentation)

Checklist

• [x] My code adheres to the e107 code style standard.
• [ ] I have read the contributing document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests pass.