fix configHash in app configuration

[taikonavt]

In app in Configuration.java configHash didn't work, because configData.readString() remove all bytes from configData, so hash was calculated from empty string every time.

[codecov-commenter]

Codecov Report

Merging #546 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #546   +/-   ##
=========================================
  Coverage     83.71%   83.71%           
  Complexity      479      479           
=========================================
  Files            42       42           
  Lines          2345     2345           
  Branches        233      233           
=========================================
  Hits           1963     1963           
  Misses          299      299           
  Partials         83       83           

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[iainmcgin]

Hi @taikonavt , I'll need you to sign the OpenID CLA to merge this.

See: https://github.com/openid/AppAuth-Android/blob/master/CONTRIBUTING.md

Once you've signed it and sent it to the foundation, send me a copy also and I'll get this merged.

[taikonavt]

Preview attachment Maxim Goncharov_All WGs_Contribution Agreement_2020-05-29.pdf Maxim Goncharov_All WGs_Contribution Agreement_2020-05-29.pdf 234 KB <https://mail.google.com/mail/u/0?ui=2&ik=38ea670ff3&attid=0.1&permmsgid=msg-f:1668047485033418102&th=1726185995e68d76&view=att&disp=inline>

…

On Thu, Jun 18, 2020 at 7:07 PM Iain McGinniss ***@***.***> wrote: Hi @taikonavt <https://github.com/taikonavt> , I'll need you to sign the OpenID CLA to merge this. See: https://github.com/openid/AppAuth-Android/blob/master/CONTRIBUTING.md Once you've signed it and sent it to the foundation, send me a copy also and I'll get this merged. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#546 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACH3KQE4TNX7H3BR5TY33FTRXI3TZANCNFSM4NN5TAUA> .

[smartabnman]

In app in Configuration.java configHash didn't work, because configData.readString() remove all bytes from configData, so hash was calculated from empty string every time.