[Bug fix] remove redirect to about:blank page

[eliat123]

Solves #1161

Background:

The code change that was introduced in https://github.com/Versent/saml2aws/pull/1157/files#diff-5cd59a5a8d31c61bb9c035ee3524699cd8e97b722683501d805074f7d11b7ee9R102-R103

was done because of a signature change with the new release:
https://github.com/playwright-community/playwright-go/blob/main/page.go#L567

The cb method is not an error callback, but a general callback which is not mandatory:

https://github.com/playwright-community/playwright-go/blob/ddc7abdd06db016d63664de1ab08870195085ddb/waiter.go#L144

The issue

The redirect to blank page created an unwanted side-effect that did not allow saml2aws to continue with AWS role selection as described in #1161.

This is the fix.

FYI @gliptak

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0b61e6e) 39.22% compared to head (14a1f34) 39.24%.

Files	Patch %	Lines
pkg/provider/browser/browser.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1164      +/-   ##
==========================================
+ Coverage   39.22%   39.24%   +0.01%     
==========================================
  Files          53       53              
  Lines        8025     8022       -3     
==========================================
  Hits         3148     3148              
+ Misses       4455     4452       -3     
  Partials      422      422              

Flag	Coverage Δ
unittests	39.24% <0.00%> (+0.01%)	⬆️

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[gliptak]

Thank you for correcting my understanding of updated behaviour and working through this @eliat123

[mapkon]

CC: @gliptak

[gliptak]

👍