app-crypt/nitrokey-app: Fix resources build.

app-crypt/nitrokey-app: Fix resources build.

We need to remove qt5_add_resources() call from CMakeLists.txt becuase AUTORCC mode is enabled.
Keeping both flags doesn't permit (in some setup) to include the resources into the final executable producing the following log messages:

qt.svg: Cannot open file ':/images/new/icon_NK.svg', because: No such file or directory
qt.svg: Cannot open file ':/images/new/icon_NK.svg', because: No such file or directory
qt.svg: Cannot open file ':/images/new/icon_NK.svg', because: No such file or directory
qt.svg: Cannot open file ':/images/new/icon_NK.svg', because: No such file or directory
...

Also translations will not work because the translation files are included by means resources.

See also https://github.com/Nitrokey/nitrokey-app/pull/346

Closes: https://bugs.gentoo.org/653158
Closes: https://github.com/gentoo/gentoo/pull/8024