SUMMARY
When changes are made to the touchpad settings in System Settings, the `Apply` button is not clickable, and remains greyed out.

STEPS TO REPRODUCE
1. Open System Settings -> Input Devices -> Touchpad
2. Make any change to settings

OBSERVED RESULT
Apply is not clickable, and settings are not updated

EXPECTED RESULT
Apply is clickable, and settings are updated

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20220207
KDE Plasma Version: 5.24.0
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.5-1-default (64-bit)
Graphics Platform: X11
Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor: AMD RENOIR

ADDITIONAL INFORMATION
Output of `xinput list`
```
~> xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Wacom HID 5215 Pen stylus                 id=11   [slave  pointer  (2)]
⎜   ↳ Wacom HID 5215 Finger touch               id=12   [slave  pointer  (2)]
⎜   ↳ MSFT0001:00 06CB:CE2D Mouse               id=13   [slave  pointer  (2)]
⎜   ↳ MSFT0001:00 06CB:CE2D Touchpad            id=14   [slave  pointer  (2)]
⎜   ↳ Wacom HID 5215 Pen eraser                 id=16   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=15   [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Ideapad extra buttons                     id=10   [slave  keyboard (3)]
    ↳ Integrated Camera: Integrated C           id=17   [slave  keyboard (3)]
```