Description of problem:
Simulation section in the property bar contains properties for all distribution types at the same moment.

Version-Release number of selected component (if applicable):
6.0.0 DR3

How reproducible:
Show property bar for end node.

Steps to Reproduce:
1. put end node on canvas
2. show property bar for this task

Actual results:
There is processing time (min, max, mean) and standard deviation at the same time.

Expected results:
Same behaviour like for others types of task (human, manual, etc.)

• normal - processing time (mean) and standard deviation
• uniform, random - processing time (min, max)
• poisson - processing time (mean)

Additional info:
related with 959182