Fix popup not opening on iPad

[arjun-dureja]

Summary

• There's an issue on iPads where the object returned from window.open stays defined even after the window/tab is closed. This causes the popup to not be opened when one was opened in the past due to this line of code:
  

  coinbase-wallet-sdk/packages/wallet-sdk/src/core/communicator/Communicator.ts

  Lines 82 to 83 in 53f3774

  	waitForPopupLoaded = async (): Promise<Window> => {
  	if (this.popup) return this.popup;

• To solve this, I added a check for popup.closed on the same line, so that the popup is opened again when it's closed

How did you test your changes?

• Manually and unit tests
• Also verified that it's still working as expected on other devices

Before	After
Screen.Recording.2024-05-22.at.2.12.03.PM.mov	Screen.Recording.2024-05-22.at.2.12.40.PM.mov

[bangtoven]

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