Removes unused variable

Removes the unused 'rng' variable from the trees script.
This simplifies the code and reduces unnecessary memory allocation.

Entities/GroundTile/scripts/trees.gd

@@ -5,7 +5,6 @@ extends Node3D
 @export var min_distance: float = 0.5
 var spawned_positions: Array[Vector3] = []
 var parent_ground_tile: GroundTile
-# Remove this line: var rng: RandomClass = RandomClass.new()
 
 func _ready():
 	parent_ground_tile = get_parent() as GroundTile