Volvo Loader Bucket Improvement

Hello everyone, I made a small improvement to the Volvo loader buckets, namely their volume.

List of buckets:
- l120H HighTipShovel 5000 liters;
- l120H RockShovel 7000 liters;
- l120H Shovel 5600 liters;
- l180H HighTipShovel 50000 liters;
- l180H RockShovel 10000 liters;
- lm841 RockShovel 1000 liters;
- lm841 Shovel 2400 liters;

Hope you like it, enjoy using it.