Fix audio settings button missing on some devices

[ahmedre]

This patch fixes the audio settings button going missing on some devices
(devices with width of 320dp, for example). It sets a width per button
to ensure that everything fits, and assigns weight of 1 to each so that
the buttons can have more space if the space available is more.

[ahmedre]

before (Nexus S emulator in portrait)

after (Nexus S emulator in portrait)

after (Nexus S emulator in landscape)

after (Pixel 9 Pro emulator in landscape)

[github-actions]

OLD: app-madani-debug.apk (signature: V1, V2)
NEW: app-madani-debug.apk (signature: V1, V2)

          │           compressed           │          uncompressed          
          ├───────────┬───────────┬────────┼───────────┬───────────┬────────
 APK      │ old       │ new       │ diff   │ old       │ new       │ diff   
──────────┼───────────┼───────────┼────────┼───────────┼───────────┼────────
      dex │  24.1 MiB │  24.1 MiB │ +700 B │  74.8 MiB │  74.8 MiB │ +3 KiB 
     arsc │   2.7 MiB │   2.7 MiB │    0 B │   2.7 MiB │   2.7 MiB │    0 B 
 manifest │   5.8 KiB │   5.8 KiB │    0 B │    28 KiB │    28 KiB │    0 B 
      res │   1.7 MiB │   1.7 MiB │    0 B │     2 MiB │     2 MiB │    0 B 
   native │  18.8 KiB │  18.8 KiB │    0 B │  36.5 KiB │  36.5 KiB │    0 B 
    asset │ 404.2 KiB │ 404.2 KiB │    0 B │ 678.6 KiB │ 678.6 KiB │    0 B 
    other │ 218.4 KiB │ 218.4 KiB │   +2 B │ 464.6 KiB │ 464.6 KiB │    0 B 
──────────┼───────────┼───────────┼────────┼───────────┼───────────┼────────
    total │  29.2 MiB │  29.2 MiB │ +702 B │  80.6 MiB │  80.6 MiB │ +3 KiB