Volume change on Android client

[yegor-pelykh]

Bug Description

During a session on Android phone, it is not possible to adjust the volume using the hardware "volume" buttons.
The indicator panel doesn't appear, and the volume does not change.

This is critical if sound is being transmitted from a remote device and its volume level needs to be adjusted.

How to Reproduce

1. Connect from Android client to Windows client (in my case) which transmits sound
2. Try to change the volume by hardware buttons "Volume Up" and "Volume Down"

Expected Behavior

The volume buttons should change the sound volume of the remote client.

Operating system(s) on local side and remote side

Android -> Windows 11

RustDesk Version(s) on local side and remote side

1.1.9 -> 1.1.9

Screenshots

[No screenshots]

Additional Context

No response