Fix FormSubmitButton selector

[atomiix]

Questions	Answers
Branch?	develop
Description?	Since #24791, we use the arrow function (() => {}) for $(document).on() which give this the instance of the class FormSubmitButton and not the selector like before. This PR fixes it by using event.target instead.
Type?	bug fix
Category?	BO
BC breaks?	no
Deprecations?	no
Fixed ticket?	Fixes #26985 & Fixes #27311
How to test?	Please see #26985
Possible impacts?	This should have a (positive) impact where FormSubmitButton is used: The button to delete the cover image of category in Sell > Catalog > Categories The button to delete the menu thumbnails image of category in Sell > Catalog > Categories

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This change is 

[NeOMakinG]

Works, you can also use a function instead of an arrow function if the scope is fine

[HanaRebaiQA]

Hello @atomiix

I have tested this PR, but the test is blocked because of these issues : #27237 and this #27303
So, will check again after the fix of the issues.

Thanks!

[HanaRebaiQA]

Hello @atomiix

I checked again this PR, but it still blocked because of this issue.
It will be tested again when the issue will be fixed.

Thanks!

[HanaRebaiQA]

Hello @atomiix

Finally, i have tested this PR after being blocked.
I checked all the related issues, they are fixed.
I checked with multistore, different image format, different langauges (as RTL) and different browsers (Chrome & Firefox)

PR27228.mp4

firefox.mp4

multistore.+.all.format.images.+.FO.result.mp4

RTL.languages.mp4

So, QA ✔️

Thanks!

[Progi1984]

Thanks @atomiix & @HanaRebaiQA