[REF] point_of_sale: simplify numpad tour util

[vlst-odoo]

When simply using :contains for targeting a specific button on the numpad we might run into the issue where doing :contains('1') targets the +10 button instead of the 1 button.

To solve this we currently rely on overly complicated js code.

In this commit we simplify the code by taking advantage of regex.

Task: 4214042

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[robodoo]

[caburj]

Nice. I didn't know that contains works with regex.

[caburj]

robodoo r+

[vlst-odoo]

Nice. I didn't know that contains works with regex.

indeed, only the hoot version does