Mobile - Set default pool for Avail

[ThaoNguyen998]

Describe the task

• [x] Set "SubWallet Official 01" as the default pool for Avail
• [x] Set validator as the default validator for Avail

[ThaoNguyen998]

Version test: v 1.1.71(411) Device test: IP 11, S20 FE 5G

Validation passed.

• Set "SubWallet Official 01" as the default pool for Avail
• Set validator as the default validator for Avail: Auto select 16 validator
  • Auto-select SubWallet Stake
  • Status # Blocked
  • Commission < 100%