can't dismiss the captcha modal using "X"

[kjozwiak]

Description

Once you've clicked on Claim my free tokens and received the captcha modal, you won't be able to dismiss the modal using either X or the ESC key.

Steps to Reproduce

1. launch brave using LEDGER_VERBOSE=true LEDGER_ENVIRONMENT=staging (used 0.24.100 de50a5a which was provided by @NejcZdovc)
2. go into about:preferences#payments and enable Brave Payments
3. click on Claim my free tokens
4. once you get the captcha, attempt to close it via ESC or X

Actual result:

Once the captcha modal is visible, the user can't close it via X nor using the ESC key.

Expected result:

Users should be able to dismiss the captcha modal using either the X or using the ESC key.

Reproduces how often:

100% reproducible using STR mentioned above.

Brave Version

about:brave info:

Brave: 0.24.100 
V8: 6.6.346.32 
rev: de50a5a6b058be47b5cf958cd65215793c0a335b 
Muon: 6.0.12 
OS Release: 17.5.0 
Update Channel: Nightly 
OS Architecture: x64 
OS Platform: macOS 
Node.js: 7.9.0 
Brave Sync: v1.4.2 
libchromiumcontent: 66.0.3359.170

Reproducible on current live release:

No, the captcha feature is slated to be released in this milestone.

Additional Information

Reproduced by @mandar-brave as well.

[NejcZdovc]

Closed with #14189. This overlays are working only with button and not with ESC

[btlechowski]

Verified on Ubuntu 17.10 x64

• 0.22.722 1dde2a2
• muon 6.0.12
• libchromiumcontent 66.0.3359.170

Verified with macOS 10.12.6 using

• 0.22.722 1dde2a2
• muon 6.0.12
• libchromiumcontent 66.0.3359.170

Verified on Windows x64 using

• 0.22.723 edb3e88
• muon 6.0.12
• libchromiumcontent 66.0.3359.170