Fix Effortless Building only being able to use the stack in hand

[Irgendwer01]

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[what-the-diff]

PR Summary

• Elimination of UTInventoryHelperMixin.java
  The team decided to delete a file named UTInventoryHelperMixin.java. This used to modify how our application finds and deals with items within the system.
• Modification in UTSurvivalHelperMixin.java
  There's been a change in the UTSurvivalHelperMixin.java file. A specific line was deleted that was previously changing how the application would behave during the placement of blocks within our system.
• Update in mixins.mods.effortlessbuilding.json
  To reflect previous changes, UTInventoryHelperMixin which was deleted, has also been removed from the mixins.mods.effortlessbuilding.json. This ensures that the code arrangement within this file matches with the current state of our codebase.