[Overlapping] Support 0 as a value for max

[GrandSchtroumpf]

fix #1349

Automatically recalculate price if set by the user to "0". https://github.com/user-attachments/assets/d854aff3-553b-43bb-886a-6d9c2dee459c

Test case :

• Create overlapping strategy
• Edit Price of this strategy
• Select anchor and set budget
• Change max to 0

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