refactor: get selected wallet and network by default

[ovitrif]

Description

Refactors the code to replace occurrences of

if (!selectedNetwork) {
  selectedNetwork = getSelectedNetwork();
}

and / or :

if (!selectedWallet) {
  selectedWallet = getSelectedWallet();
}

with default parameter values, ie.

selectedWallet = getSelectedWallet(),
selectedNetwork = getSelectedNetwork(),

Type of change

• Refactoring (improving code without creating new functionality)

Tests

• No test

[ovitrif]

@limpbrains e2e-ios fails here, should I be concerned? the one on macmini succeeds 🤔

It seems unrelated to the changes (IMHO), though I wonder what might cause the failure

From build logs these seemed to stand out:

[!] Error installing hermes-engine

and

Errno::EEXIST - File exists @ syserr_fail2_in - /Users/runner/Library/Caches/CocoaPods/Pods/External/hermes-engine/297ebba3ddadb20a86a625cc0bfe59ba-9180d/destroot/Library/Frameworks/universal/hermes.xcframework/ios-arm64_x86_64-maccatalyst/hermes.framework/Resources

[limpbrains]

Yes, it is unrelated. Broken cocoapods version