Fix keepass-cr-recovery

[toelke]

keepass-cr-recovery used the challenge unpadded, add padding as in
https://github.com/keepassxreboot/keepassxc/blob/develop/src/keys/drivers/YubiKeyInterfaceUSB.cpp\#L291
https://github.com/keepassxreboot/keepassxc/blob/develop/src/keys/drivers/YubiKeyInterfacePCSC.cpp\#L747

Closes #4744

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[codecov-commenter]

Codecov Report

Merging #7521 (7bff050) into develop (8f76ea3) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #7521      +/-   ##
===========================================
+ Coverage    64.30%   64.32%   +0.02%     
===========================================
  Files          339      339              
  Lines        43364    43364              
===========================================
+ Hits         27881    27891      +10     
+ Misses       15483    15473      -10     

Impacted Files	Coverage Δ
src/core/Entry.cpp	82.65% <0.00%> (-0.10%)	⬇️
src/fdosecrets/dbus/DBusMgr.cpp	53.67% <0.00%> (+1.47%)	⬆️
...rc/fdosecrets/widgets/SettingsWidgetFdoSecrets.cpp	62.16% <0.00%> (+3.24%)	⬆️

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