Fix errors in SlimefunUtils.java

[mcchampions]

Description

4212

This issue explains why to change.

or move equalsItemMeta check to if (id != null && id.equals(possibleItemId)) {?

Proposed changes

• remove equalsItemMeta check
• rename var

Related Issues (if applicable)

4212

Checklist

• [ ] I have fully tested the proposed changes and promise that they will not break everything into chaos.
• [ ] I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• [x] I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16. - 1.20.).
• [x] I followed the existing code standards and didn't mess up the formatting.
• [x] I did my best to add documentation to any public classes or methods I added.
• [x] I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• [ ] I added sufficient Unit Tests to cover my code.

[github-actions[bot]]

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feature/**	🎈 Feature
fix/**	✨ Fix
chore/**	🧹 Chores
api/**	🔧 API
performance/**	💡 Performance Optimization
compatibility/**	🤝 Compatibility

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