Fix JS bug in submit: incorrect variable caused missing variant selection

[saidaLachgar]

Questions	Answers
Description?	Fixes a JavaScript bug where an incorrect variable name caused the product reminder submission to ignore the selected product variant. This resulted in reminders being sent without specifying which combination (e.g., size/color) the user wanted to be notified about. The issue occurs on the product page when combinations are available.
Type?	bug fix
BC breaks?	no
Deprecations?	no
Fixed ticket?	not sure.
How to test?	On a product with combinations, go to the front office and try to subscribe for an out-of-stock variant. Before the fix, the reminder would be submitted without specifying the variant. After the fix, the correct variant should be included in the submission and the reminder handled accordingly.

[nicosomb]

Good catch 👏