Fix heap-use-after-free & error-msg output in keepassxc-cli #5368
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Proposed fix for #5367
After investigating with AddressSanitizer it seems that
the ~Database destructor is called twice, since the QSharedPointer
variable cmd->currentDatabase & currentDatabase is initialized to
the the same address.
also fixed a issue with the cli unkown command output, since
in case of a wrong command only a "\n" character is appended to the
Utils::STDERR textstream but not flushed & printed.
Upon exitting the shell the stream is flushed and if a bunch of unkown
commands are entered all of them are subsequently printed.
With endl the newline char is appended and the error-message is flushed,
printed and the shell continues.
Testing strategy
Screenshots
Type of change