Auto-close the network selector screen when a network is selected

[srirambv]

Description

As part of #20471, we show a full screen network selection page. But selecting a network doesn't auto-close the screen and go back to portfolio causing user to do an extra swipe/tap to go back. This should be avoided as the user made a selection already

Steps to reproduce

1. Create a wallet on Beta
2. Select network dropdown
3. Select a different network, screen is not auto closed

Actual result

Network.Auto.close.mp4

Expected result

Auto-close the network selector screen when a network is selected

Issue reproduces how often

Easy

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version? NA
• Can you reproduce this issue with the current Play Store Beta version? Yes
• Can you reproduce this issue with the current Play Store Nightly version? Yes

Device details

• Install type (ARM, x86): ARM
• Device type (Phone, Tablet, Phablet):All
• Android version: All

Brave version

1.38.103

Website problems only

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards?NA
• Is the issue reproducible on the latest version of Chrome? NA

Additional information

[srirambv]

Verification passed on Oppo Reno 5 with Android 12 running 1.40.86 x64 build

• Verified steps from issue description
• Verified selecting a network automatically closes the drop-down selector

22424-ARM.mp4

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Verification passed on Samsung Tab A with Android 10 running 1.40.86 x64 build

• Verified steps from issue description
• Verified selecting a network automatically closes the drop-down selector

22424-Tab.mp4