Move some audio models out of app and clean up

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 │  12.6 MiB │  12.6 MiB │ -556 B │    32 MiB │    32 MiB │ -1.1 KiB 
     arsc │   2.2 MiB │   2.2 MiB │    0 B │   2.2 MiB │   2.2 MiB │      0 B 
 manifest │   5.6 KiB │   5.6 KiB │    0 B │  27.1 KiB │  27.1 KiB │      0 B 
      res │   1.6 MiB │   1.6 MiB │    0 B │   1.8 MiB │   1.8 MiB │      0 B 
    asset │ 404.2 KiB │ 404.2 KiB │    0 B │ 678.6 KiB │ 678.6 KiB │      0 B 
    other │ 189.2 KiB │ 189.2 KiB │  +11 B │ 387.5 KiB │ 387.5 KiB │      0 B 
──────────┼───────────┼───────────┼────────┼───────────┼───────────┼──────────
    total │    17 MiB │    17 MiB │ -545 B │  37.1 MiB │  37.1 MiB │ -1.1 KiB
quran / quran_android

Move some audio models out of app and clean up #2542
