[Regression] Continuous activation of mapped scroll wheel only applied once

[adelq]

Steps to reproduce:

1. Launch antimicro
2. Map "Mouse Wheel Up" to any gamepad button
3. Hold on gamepad button

Expected:
Continue to scroll when holding down on gamepad button (behavior before in v2.24.1 and before de44bee)

Actual:
Scroll stops as though button was only pressed once

This behavior is exhibited no matter what button is mapped to the scroll wheel. Other mappings, both keyboard and mouse seem to activate continuously (though I haven't tested all of them). This is a regression between 2.24.1 and 2.24.2, specifically in commit de44bee and is still present in the latest version in master. There were many changes made in that commit, and I haven't gotten a chance to pick it apart yet.

Environment:
antimicro version: 2.24.2
Controller: PS3 DualShock 3 controller
OS: Linux 4.19.73