Couldn't input backslash(\), pipe(|) and Muhenkan in Japanese keyboard #1962

Describe the bug
Pressing the backslash, pipe or Muhenkan key on a Japanese keyboard layout will not produce any input.

Steps to reproduce
Attempting to type backslash, pipe, or Muhenkan key into a text area

Screenshots

Affected games
All

Moonlight settings (please complete the following information)

• Have any settings been adjusted from defaults?: No

Client PC details (please complete the following information)

• OS: Kubuntu 26.04
• Moonlight Version: 6.1.0
• GPU: Intel® Iris® Xe Graphics
• Linux package type (if applicable): Deb package

Server PC details (please complete the following information)

• OS: [e.g. Windows 10 1809]
• Sunshine or GeForce Experience version: [e.g. Sunshine v0.21.0]
• GPU: NVIDIA RTX 5070
• GPU driver: 595.84