Fix of player's getting kicked while renaming text in Anvil

I've recently found out a bug that caused players to get kicked when they edited a text in an Anvil while using a dev version of BungeePackFix. As our players were getting more and more angry with the anvils, I couldn't have longer and started investigating this issue myself.

Luckily I was able to fix this issue and here's a release of this fix before LoneDev merges the PR and releases a JAR containing such fix.