Missing PS4 Touchpad on SDL

### Game Name?

_No response_

### Game ID?

_No response_

### Input device ID?

SDL/0/PS4 Controller

### Dolphin version?

5.0-21264

### Operating System?

Windows 10

### Describe the bug.

In the JSONs, under "SDL/0/PS4 Controller", the following key is missing:

"\`Touchpad`": "../#DefaultDevices/DualShock4/<style>/Touchpad.png"

### Expected behavior.

_No response_