[FIX] point_of_sale: update method name to avoid conflict with another method
[FIX] point_of_sale: update method name to avoid conflict with another method

Because of same method name point of sale's onchange method overrides sale's
onchange method. Sale's method is therefore not called anymore.

Fix related to commit https://github.com/odoo/odoo/commit/e434690fe3adf884222b84e16dac3b3dcc0b12ad. See task/issue ID #1854683.
Closes #25116.

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